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.. GENERATED by help2rst.py. DO NOT EDIT DIRECTLY.
.. program:: nghttpx
nghttpx(1)
==========
SYNOPSIS
--------
**nghttpx** [OPTIONS]... [<PRIVATE_KEY> <CERT>]
DESCRIPTION
-----------
A reverse proxy for HTTP/2, HTTP/1 and SPDY.
.. describe:: <PRIVATE_KEY>
Set path to server's private key. Required unless
"no-tls" parameter is used in :option:`--frontend` option.
.. describe:: <CERT>
Set path to server's certificate. Required unless
"no-tls" parameter is used in :option:`--frontend` option. To
make OCSP stapling work, this must be an absolute path.
OPTIONS
-------
The options are categorized into several groups.
Connections
~~~~~~~~~~~
.. option:: -b, --backend=(<HOST>,<PORT>|unix:<PATH>)[;[<PATTERN>[:...]][[;<PARAM>]...]
Set backend host and port. The multiple backend
addresses are accepted by repeating this option. UNIX
domain socket can be specified by prefixing path name
with "unix:" (e.g., unix:/var/run/backend.sock).
Optionally, if <PATTERN>s are given, the backend address
is only used if request matches the pattern. If
:option:`--http2-proxy` is used, <PATTERN>s are ignored. The
pattern matching is closely designed to ServeMux in
net/http package of Go programming language. <PATTERN>
consists of path, host + path or just host. The path
must start with "*/*". If it ends with "*/*", it matches
all request path in its subtree. To deal with the
request to the directory without trailing slash, the
path which ends with "*/*" also matches the request path
which only lacks trailing '*/*' (e.g., path "*/foo/*"
matches request path "*/foo*"). If it does not end with
"*/*", it performs exact match against the request path.
If host is given, it performs exact match against the
request host. If host alone is given, "*/*" is appended
to it, so that it matches all request paths under the
host (e.g., specifying "nghttp2.org" equals to
"nghttp2.org/").
Patterns with host take precedence over patterns with
just path. Then, longer patterns take precedence over
shorter ones.
Host can include "\*" in the left most position to
indicate wildcard match (only suffix match is done).
The "\*" must match at least one character. For example,
host pattern "\*.nghttp2.org" matches against
"www.nghttp2.org" and "git.ngttp2.org", but does not
match against "nghttp2.org". The exact hosts match
takes precedence over the wildcard hosts match.
If <PATTERN> is omitted or empty string, "*/*" is used as
pattern, which matches all request paths (catch-all
pattern). The catch-all backend must be given.
When doing a match, nghttpx made some normalization to
pattern, request host and path. For host part, they are
converted to lower case. For path part, percent-encoded
unreserved characters defined in RFC 3986 are decoded,
and any dot-segments (".." and ".") are resolved and
removed.
For example, :option:`-b`\'127.0.0.1,8080;nghttp2.org/httpbin/'
matches the request host "nghttp2.org" and the request
path "*/httpbin/get*", but does not match the request host
"nghttp2.org" and the request path "*/index.html*".
The multiple <PATTERN>s can be specified, delimiting
them by ":". Specifying
:option:`-b`\'127.0.0.1,8080;nghttp2.org:www.nghttp2.org' has the
same effect to specify :option:`-b`\'127.0.0.1,8080;nghttp2.org'
and :option:`-b`\'127.0.0.1,8080;www.nghttp2.org'.
The backend addresses sharing same <PATTERN> are grouped
together forming load balancing group.
Several parameters <PARAM> are accepted after <PATTERN>.
The parameters are delimited by ";". The available
parameters are: "proto=<PROTO>", "tls",
"sni=<SNI_HOST>", "fall=<N>", "rise=<N>", and
"affinity=<METHOD>". The parameter consists of keyword,
and optionally followed by "=" and value. For example,
the parameter "proto=h2" consists of the keyword "proto"
and value "h2". The parameter "tls" consists of the
keyword "tls" without value. Each parameter is
described as follows.
The backend application protocol can be specified using
optional "proto" parameter, and in the form of
"proto=<PROTO>". <PROTO> should be one of the following
list without quotes: "h2", "http/1.1". The default
value of <PROTO> is "http/1.1". Note that usually "h2"
refers to HTTP/2 over TLS. But in this option, it may
mean HTTP/2 over cleartext TCP unless "tls" keyword is
used (see below).
TLS can be enabled by specifying optional "tls"
parameter. TLS is not enabled by default.
With "sni=<SNI_HOST>" parameter, it can override the TLS
SNI field value with given <SNI_HOST>. This will
default to the backend <HOST> name
The feature to detect whether backend is online or
offline can be enabled using optional "fall" and "rise"
parameters. Using "fall=<N>" parameter, if nghttpx
cannot connect to a this backend <N> times in a row,
this backend is assumed to be offline, and it is
excluded from load balancing. If <N> is 0, this backend
never be excluded from load balancing whatever times
nghttpx cannot connect to it, and this is the default.
There is also "rise=<N>" parameter. After backend was
excluded from load balancing group, nghttpx periodically
attempts to make a connection to the failed backend, and
if the connection is made successfully <N> times in a
row, the backend is assumed to be online, and it is now
eligible for load balancing target. If <N> is 0, a
backend is permanently offline, once it goes in that
state, and this is the default behaviour.
The session affinity is enabled using
"affinity=<METHOD>" parameter. If "ip" is given in
<METHOD>, client IP based session affinity is enabled.
If "none" is given in <METHOD>, session affinity is
disabled, and this is the default. The session affinity
is enabled per <PATTERN>. If at least one backend has
"affinity" parameter, and its <METHOD> is not "none",
session affinity is enabled for all backend servers
sharing the same <PATTERN>. It is advised to set
"affinity" parameter to all backend explicitly if
session affinity is desired. The session affinity may
break if one of the backend gets unreachable, or backend
settings are reloaded or replaced by API.
Since ";" and ":" are used as delimiter, <PATTERN> must
not contain these characters. Since ";" has special
meaning in shell, the option value must be quoted.
Default: ``127.0.0.1,80``
.. option:: -f, --frontend=(<HOST>,<PORT>|unix:<PATH>)[[;<PARAM>]...]
Set frontend host and port. If <HOST> is '\*', it
assumes all addresses including both IPv4 and IPv6.
UNIX domain socket can be specified by prefixing path
name with "unix:" (e.g., unix:/var/run/nghttpx.sock).
This option can be used multiple times to listen to
multiple addresses.
This option can take 0 or more parameters, which are
described below. Note that "api" and "healthmon"
parameters are mutually exclusive.
Optionally, TLS can be disabled by specifying "no-tls"
parameter. TLS is enabled by default.
To make this frontend as API endpoint, specify "api"
parameter. This is disabled by default. It is
important to limit the access to the API frontend.
Otherwise, someone may change the backend server, and
break your services, or expose confidential information
to the outside the world.
To make this frontend as health monitor endpoint,
specify "healthmon" parameter. This is disabled by
default. Any requests which come through this address
are replied with 200 HTTP status, without no body.
Default: ``*,3000``
.. option:: --backlog=<N>
Set listen backlog size.
Default: ``512``
.. option:: --backend-address-family=(auto|IPv4|IPv6)
Specify address family of backend connections. If
"auto" is given, both IPv4 and IPv6 are considered. If
"IPv4" is given, only IPv4 address is considered. If
"IPv6" is given, only IPv6 address is considered.
Default: ``auto``
.. option:: --backend-http-proxy-uri=<URI>
Specify proxy URI in the form
http://[<USER>:<PASS>@]<PROXY>:<PORT>. If a proxy
requires authentication, specify <USER> and <PASS>.
Note that they must be properly percent-encoded. This
proxy is used when the backend connection is HTTP/2.
First, make a CONNECT request to the proxy and it
connects to the backend on behalf of nghttpx. This
forms tunnel. After that, nghttpx performs SSL/TLS
handshake with the downstream through the tunnel. The
timeouts when connecting and making CONNECT request can
be specified by :option:`--backend-read-timeout` and
:option:`--backend-write-timeout` options.
.. option:: --accept-proxy-protocol
Accept PROXY protocol version 1 on frontend connection.
Performance
~~~~~~~~~~~
.. option:: -n, --workers=<N>
Set the number of worker threads.
Default: ``1``
.. option:: --read-rate=<SIZE>
Set maximum average read rate on frontend connection.
Setting 0 to this option means read rate is unlimited.
Default: ``0``
.. option:: --read-burst=<SIZE>
Set maximum read burst size on frontend connection.
Setting 0 to this option means read burst size is
unlimited.
Default: ``0``
.. option:: --write-rate=<SIZE>
Set maximum average write rate on frontend connection.
Setting 0 to this option means write rate is unlimited.
Default: ``0``
.. option:: --write-burst=<SIZE>
Set maximum write burst size on frontend connection.
Setting 0 to this option means write burst size is
unlimited.
Default: ``0``
.. option:: --worker-read-rate=<SIZE>
Set maximum average read rate on frontend connection per
worker. Setting 0 to this option means read rate is
unlimited. Not implemented yet.
Default: ``0``
.. option:: --worker-read-burst=<SIZE>
Set maximum read burst size on frontend connection per
worker. Setting 0 to this option means read burst size
is unlimited. Not implemented yet.
Default: ``0``
.. option:: --worker-write-rate=<SIZE>
Set maximum average write rate on frontend connection
per worker. Setting 0 to this option means write rate
is unlimited. Not implemented yet.
Default: ``0``
.. option:: --worker-write-burst=<SIZE>
Set maximum write burst size on frontend connection per
worker. Setting 0 to this option means write burst size
is unlimited. Not implemented yet.
Default: ``0``
.. option:: --worker-frontend-connections=<N>
Set maximum number of simultaneous connections frontend
accepts. Setting 0 means unlimited.
Default: ``0``
.. option:: --backend-connections-per-host=<N>
Set maximum number of backend concurrent connections
(and/or streams in case of HTTP/2) per origin host.
This option is meaningful when :option:`--http2-proxy` option is
used. The origin host is determined by authority
portion of request URI (or :authority header field for
HTTP/2). To limit the number of connections per
frontend for default mode, use
:option:`--backend-connections-per-frontend`\.
Default: ``8``
.. option:: --backend-connections-per-frontend=<N>
Set maximum number of backend concurrent connections
(and/or streams in case of HTTP/2) per frontend. This
option is only used for default mode. 0 means
unlimited. To limit the number of connections per host
with :option:`--http2-proxy` option, use
:option:`--backend-connections-per-host`\.
Default: ``0``
.. option:: --rlimit-nofile=<N>
Set maximum number of open files (RLIMIT_NOFILE) to <N>.
If 0 is given, nghttpx does not set the limit.
Default: ``0``
.. option:: --backend-request-buffer=<SIZE>
Set buffer size used to store backend request.
Default: ``16K``
.. option:: --backend-response-buffer=<SIZE>
Set buffer size used to store backend response.
Default: ``128K``
.. option:: --fastopen=<N>
Enables "TCP Fast Open" for the listening socket and
limits the maximum length for the queue of connections
that have not yet completed the three-way handshake. If
value is 0 then fast open is disabled.
Default: ``0``
.. option:: --no-kqueue
Don't use kqueue. This option is only applicable for
the platforms which have kqueue. For other platforms,
this option will be simply ignored.
Timeout
~~~~~~~
.. option:: --frontend-http2-read-timeout=<DURATION>
Specify read timeout for HTTP/2 and SPDY frontend
connection.
Default: ``3m``
.. option:: --frontend-read-timeout=<DURATION>
Specify read timeout for HTTP/1.1 frontend connection.
Default: ``1m``
.. option:: --frontend-write-timeout=<DURATION>
Specify write timeout for all frontend connections.
Default: ``30s``
.. option:: --stream-read-timeout=<DURATION>
Specify read timeout for HTTP/2 and SPDY streams. 0
means no timeout.
Default: ``0``
.. option:: --stream-write-timeout=<DURATION>
Specify write timeout for HTTP/2 and SPDY streams. 0
means no timeout.
Default: ``0``
.. option:: --backend-read-timeout=<DURATION>
Specify read timeout for backend connection.
Default: ``1m``
.. option:: --backend-write-timeout=<DURATION>
Specify write timeout for backend connection.
Default: ``30s``
.. option:: --backend-keep-alive-timeout=<DURATION>
Specify keep-alive timeout for backend connection.
Default: ``2s``
.. option:: --listener-disable-timeout=<DURATION>
After accepting connection failed, connection listener
is disabled for a given amount of time. Specifying 0
disables this feature.
Default: ``30s``
.. option:: --frontend-http2-setting-timeout=<DURATION>
Specify timeout before SETTINGS ACK is received from
client.
Default: ``10s``
.. option:: --backend-http2-settings-timeout=<DURATION>
Specify timeout before SETTINGS ACK is received from
backend server.
Default: ``10s``
.. option:: --backend-max-backoff=<DURATION>
Specify maximum backoff interval. This is used when
doing health check against offline backend (see "fail"
parameter in :option:`--backend` option). It is also used to
limit the maximum interval to temporarily disable
backend when nghttpx failed to connect to it. These
intervals are calculated using exponential backoff, and
consecutive failed attempts increase the interval. This
option caps its maximum value.
Default: ``2m``
SSL/TLS
~~~~~~~
.. option:: --ciphers=<SUITE>
Set allowed cipher list. The format of the string is
described in OpenSSL ciphers(1).
.. option:: --ecdh-curves=<LIST>
Set supported curve list for frontend connections.
<LIST> is a colon separated list of curve NID or names
in the preference order. The supported curves depend on
the linked OpenSSL library. This function requires
OpenSSL >= 1.0.2.
Default: ``P-256:P-384:P-521``
.. option:: -k, --insecure
Don't verify backend server's certificate if TLS is
enabled for backend connections.
.. option:: --cacert=<PATH>
Set path to trusted CA certificate file used in backend
TLS connections. The file must be in PEM format. It
can contain multiple certificates. If the linked
OpenSSL is configured to load system wide certificates,
they are loaded at startup regardless of this option.
.. option:: --private-key-passwd-file=<PATH>
Path to file that contains password for the server's
private key. If none is given and the private key is
password protected it'll be requested interactively.
.. option:: --subcert=<KEYPATH>:<CERTPATH>[[;<PARAM>]...]
Specify additional certificate and private key file.
nghttpx will choose certificates based on the hostname
indicated by client using TLS SNI extension. This
option can be used multiple times. To make OCSP
stapling work, <CERTPATH> must be absolute path.
Additional parameter can be specified in <PARAM>. The
available <PARAM> is "sct-dir=<DIR>".
"sct-dir=<DIR>" specifies the path to directory which
contains \*.sct files for TLS
signed_certificate_timestamp extension (RFC 6962). This
feature requires OpenSSL >= 1.0.2. See also
:option:`--tls-sct-dir` option.
.. option:: --dh-param-file=<PATH>
Path to file that contains DH parameters in PEM format.
Without this option, DHE cipher suites are not
available.
.. option:: --npn-list=<LIST>
Comma delimited list of ALPN protocol identifier sorted
in the order of preference. That means most desirable
protocol comes first. This is used in both ALPN and
NPN. The parameter must be delimited by a single comma
only and any white spaces are treated as a part of
protocol string.
Default: ``h2,h2-16,h2-14,spdy/3.1,http/1.1``
.. option:: --verify-client
Require and verify client certificate.
.. option:: --verify-client-cacert=<PATH>
Path to file that contains CA certificates to verify
client certificate. The file must be in PEM format. It
can contain multiple certificates.
.. option:: --client-private-key-file=<PATH>
Path to file that contains client private key used in
backend client authentication.
.. option:: --client-cert-file=<PATH>
Path to file that contains client certificate used in
backend client authentication.
.. option:: --tls-proto-list=<LIST>
Comma delimited list of SSL/TLS protocol to be enabled.
The following protocols are available: TLSv1.2, TLSv1.1
and TLSv1.0. The name matching is done in
case-insensitive manner. The parameter must be
delimited by a single comma only and any white spaces
are treated as a part of protocol string. If the
protocol list advertised by client does not overlap this
list, you will receive the error message "unknown
protocol".
Default: ``TLSv1.2,TLSv1.1``
.. option:: --tls-ticket-key-file=<PATH>
Path to file that contains random data to construct TLS
session ticket parameters. If aes-128-cbc is given in
:option:`--tls-ticket-key-cipher`\, the file must contain exactly
48 bytes. If aes-256-cbc is given in
:option:`--tls-ticket-key-cipher`\, the file must contain exactly
80 bytes. This options can be used repeatedly to
specify multiple ticket parameters. If several files
are given, only the first key is used to encrypt TLS
session tickets. Other keys are accepted but server
will issue new session ticket with first key. This
allows session key rotation. Please note that key
rotation does not occur automatically. User should
rearrange files or change options values and restart
nghttpx gracefully. If opening or reading given file
fails, all loaded keys are discarded and it is treated
as if none of this option is given. If this option is
not given or an error occurred while opening or reading
a file, key is generated every 1 hour internally and
they are valid for 12 hours. This is recommended if
ticket key sharing between nghttpx instances is not
required.
.. option:: --tls-ticket-key-memcached=<HOST>,<PORT>[;tls]
Specify address of memcached server to get TLS ticket
keys for session resumption. This enables shared TLS
ticket key between multiple nghttpx instances. nghttpx
does not set TLS ticket key to memcached. The external
ticket key generator is required. nghttpx just gets TLS
ticket keys from memcached, and use them, possibly
replacing current set of keys. It is up to extern TLS
ticket key generator to rotate keys frequently. See
"TLS SESSION TICKET RESUMPTION" section in manual page
to know the data format in memcached entry. Optionally,
memcached connection can be encrypted with TLS by
specifying "tls" parameter.
.. option:: --tls-ticket-key-memcached-address-family=(auto|IPv4|IPv6)
Specify address family of memcached connections to get
TLS ticket keys. If "auto" is given, both IPv4 and IPv6
are considered. If "IPv4" is given, only IPv4 address
is considered. If "IPv6" is given, only IPv6 address is
considered.
Default: ``auto``
.. option:: --tls-ticket-key-memcached-interval=<DURATION>
Set interval to get TLS ticket keys from memcached.
Default: ``10m``
.. option:: --tls-ticket-key-memcached-max-retry=<N>
Set maximum number of consecutive retries before
abandoning TLS ticket key retrieval. If this number is
reached, the attempt is considered as failure, and
"failure" count is incremented by 1, which contributed
to the value controlled
:option:`--tls-ticket-key-memcached-max-fail` option.
Default: ``3``
.. option:: --tls-ticket-key-memcached-max-fail=<N>
Set maximum number of consecutive failure before
disabling TLS ticket until next scheduled key retrieval.
Default: ``2``
.. option:: --tls-ticket-key-cipher=<CIPHER>
Specify cipher to encrypt TLS session ticket. Specify
either aes-128-cbc or aes-256-cbc. By default,
aes-128-cbc is used.
.. option:: --tls-ticket-key-memcached-cert-file=<PATH>
Path to client certificate for memcached connections to
get TLS ticket keys.
.. option:: --tls-ticket-key-memcached-private-key-file=<PATH>
Path to client private key for memcached connections to
get TLS ticket keys.
.. option:: --fetch-ocsp-response-file=<PATH>
Path to fetch-ocsp-response script file. It should be
absolute path.
Default: ``/usr/local/share/nghttp2/fetch-ocsp-response``
.. option:: --ocsp-update-interval=<DURATION>
Set interval to update OCSP response cache.
Default: ``4h``
.. option:: --no-ocsp
Disable OCSP stapling.
.. option:: --tls-session-cache-memcached=<HOST>,<PORT>[;tls]
Specify address of memcached server to store session
cache. This enables shared session cache between
multiple nghttpx instances. Optionally, memcached
connection can be encrypted with TLS by specifying "tls"
parameter.
.. option:: --tls-session-cache-memcached-address-family=(auto|IPv4|IPv6)
Specify address family of memcached connections to store
session cache. If "auto" is given, both IPv4 and IPv6
are considered. If "IPv4" is given, only IPv4 address
is considered. If "IPv6" is given, only IPv6 address is
considered.
Default: ``auto``
.. option:: --tls-session-cache-memcached-cert-file=<PATH>
Path to client certificate for memcached connections to
store session cache.
.. option:: --tls-session-cache-memcached-private-key-file=<PATH>
Path to client private key for memcached connections to
store session cache.
.. option:: --tls-dyn-rec-warmup-threshold=<SIZE>
Specify the threshold size for TLS dynamic record size
behaviour. During a TLS session, after the threshold
number of bytes have been written, the TLS record size
will be increased to the maximum allowed (16K). The max
record size will continue to be used on the active TLS
session. After :option:`--tls-dyn-rec-idle-timeout` has elapsed,
the record size is reduced to 1300 bytes. Specify 0 to
always use the maximum record size, regardless of idle
period. This behaviour applies to all TLS based
frontends, and TLS HTTP/2 backends.
Default: ``1M``
.. option:: --tls-dyn-rec-idle-timeout=<DURATION>
Specify TLS dynamic record size behaviour timeout. See
:option:`--tls-dyn-rec-warmup-threshold` for more information.
This behaviour applies to all TLS based frontends, and
TLS HTTP/2 backends.
Default: ``1s``
.. option:: --no-http2-cipher-black-list
Allow black listed cipher suite on HTTP/2 connection.
See https://tools.ietf.org/html/rfc7540#appendix-A for
the complete HTTP/2 cipher suites black list.
.. option:: --tls-sct-dir=<DIR>
Specifies the directory where \*.sct files exist. All
\*.sct files in <DIR> are read, and sent as
extension_data of TLS signed_certificate_timestamp (RFC
6962) to client. These \*.sct files are for the
certificate specified in positional command-line
argument <CERT>, or certificate option in configuration
file. For additional certificates, use :option:`--subcert`
option. This option requires OpenSSL >= 1.0.2.
HTTP/2 and SPDY
~~~~~~~~~~~~~~~
.. option:: -c, --frontend-http2-max-concurrent-streams=<N>
Set the maximum number of the concurrent streams in one
frontend HTTP/2 and SPDY session.
Default: `` 100``
.. option:: --backend-http2-max-concurrent-streams=<N>
Set the maximum number of the concurrent streams in one
backend HTTP/2 session. This sets maximum number of
concurrent opened pushed streams. The maximum number of
concurrent requests are set by a remote server.
Default: ``100``
.. option:: --frontend-http2-window-size=<SIZE>
Sets the per-stream initial window size of HTTP/2 and
SPDY frontend connection.
Default: ``65535``
.. option:: --frontend-http2-connection-window-size=<SIZE>
Sets the per-connection window size of HTTP/2 and SPDY
frontend connection. For SPDY connection, the value
less than 64KiB is rounded up to 64KiB.
Default: ``65535``
.. option:: --backend-http2-window-size=<SIZE>
Sets the initial window size of HTTP/2 backend
connection.
Default: ``65535``
.. option:: --backend-http2-connection-window-size=<SIZE>
Sets the per-connection window size of HTTP/2 backend
connection.
Default: ``2147483647``
.. option:: --http2-no-cookie-crumbling
Don't crumble cookie header field.
.. option:: --padding=<N>
Add at most <N> bytes to a HTTP/2 frame payload as
padding. Specify 0 to disable padding. This option is
meant for debugging purpose and not intended to enhance
protocol security.
.. option:: --no-server-push
Disable HTTP/2 server push. Server push is supported by
default mode and HTTP/2 frontend via Link header field.
It is also supported if both frontend and backend are
HTTP/2 in default mode. In this case, server push from
backend session is relayed to frontend, and server push
via Link header field is also supported. SPDY frontend
does not support server push.
.. option:: --frontend-http2-optimize-write-buffer-size
(Experimental) Enable write buffer size optimization in
frontend HTTP/2 TLS connection. This optimization aims
to reduce write buffer size so that it only contains
bytes which can send immediately. This makes server
more responsive to prioritized HTTP/2 stream because the
buffering of lower priority stream is reduced. This
option is only effective on recent Linux platform.
.. option:: --frontend-http2-optimize-window-size
(Experimental) Automatically tune connection level
window size of frontend HTTP/2 TLS connection. If this
feature is enabled, connection window size starts with
the default window size, 65535 bytes. nghttpx
automatically adjusts connection window size based on
TCP receiving window size. The maximum window size is
capped by the value specified by
:option:`--frontend-http2-connection-window-size`\. Since the
stream is subject to stream level window size, it should
be adjusted using :option:`--frontend-http2-window-size` option as
well. This option is only effective on recent Linux
platform.
.. option:: --frontend-http2-encoder-dynamic-table-size=<SIZE>
Specify the maximum dynamic table size of HPACK encoder
in the frontend HTTP/2 connection. The decoder (client)
specifies the maximum dynamic table size it accepts.
Then the negotiated dynamic table size is the minimum of
this option value and the value which client specified.
Default: ``4K``
.. option:: --frontend-http2-decoder-dynamic-table-size=<SIZE>
Specify the maximum dynamic table size of HPACK decoder
in the frontend HTTP/2 connection.
Default: ``4K``
.. option:: --backend-http2-encoder-dynamic-table-size=<SIZE>
Specify the maximum dynamic table size of HPACK encoder
in the backend HTTP/2 connection. The decoder (backend)
specifies the maximum dynamic table size it accepts.
Then the negotiated dynamic table size is the minimum of
this option value and the value which backend specified.
Default: ``4K``
.. option:: --backend-http2-decoder-dynamic-table-size=<SIZE>
Specify the maximum dynamic table size of HPACK decoder
in the backend HTTP/2 connection.
Default: ``4K``
Mode
~~~~
.. describe:: (default mode)
Accept HTTP/2, SPDY and HTTP/1.1 over SSL/TLS. "no-tls"
parameter is used in :option:`--frontend` option, accept HTTP/2
and HTTP/1.1 over cleartext TCP. The incoming HTTP/1.1
connection can be upgraded to HTTP/2 through HTTP
Upgrade.
.. option:: -s, --http2-proxy
Like default mode, but enable forward proxy. This is so
called HTTP/2 proxy mode.
Logging
~~~~~~~
.. option:: -L, --log-level=<LEVEL>
Set the severity level of log output. <LEVEL> must be
one of INFO, NOTICE, WARN, ERROR and FATAL.
Default: ``NOTICE``
.. option:: --accesslog-file=<PATH>
Set path to write access log. To reopen file, send USR1
signal to nghttpx.
.. option:: --accesslog-syslog
Send access log to syslog. If this option is used,
:option:`--accesslog-file` option is ignored.
.. option:: --accesslog-format=<FORMAT>
Specify format string for access log. The default
format is combined format. The following variables are
available:
* $remote_addr: client IP address.
* $time_local: local time in Common Log format.
* $time_iso8601: local time in ISO 8601 format.
* $request: HTTP request line.
* $status: HTTP response status code.
* $body_bytes_sent: the number of bytes sent to client
as response body.
* $http_<VAR>: value of HTTP request header <VAR> where
'_' in <VAR> is replaced with '-'.
* $remote_port: client port.
* $server_port: server port.
* $request_time: request processing time in seconds with
milliseconds resolution.
* $pid: PID of the running process.
* $alpn: ALPN identifier of the protocol which generates
the response. For HTTP/1, ALPN is always http/1.1,
regardless of minor version.
* $ssl_cipher: cipher used for SSL/TLS connection.
* $ssl_protocol: protocol for SSL/TLS connection.
* $ssl_session_id: session ID for SSL/TLS connection.
* $ssl_session_reused: "r" if SSL/TLS session was
reused. Otherwise, "."
* $backend_host: backend host used to fulfill the
request. "-" if backend host is not available.
* $backend_port: backend port used to fulfill the
request. "-" if backend host is not available.
The variable can be enclosed by "{" and "}" for
disambiguation (e.g., ${remote_addr}).
Default: ``$remote_addr - - [$time_local] "$request" $status $body_bytes_sent "$http_referer" "$http_user_agent"``
.. option:: --errorlog-file=<PATH>
Set path to write error log. To reopen file, send USR1
signal to nghttpx. stderr will be redirected to the
error log file unless :option:`--errorlog-syslog` is used.
Default: ``/dev/stderr``
.. option:: --errorlog-syslog
Send error log to syslog. If this option is used,
:option:`--errorlog-file` option is ignored.
.. option:: --syslog-facility=<FACILITY>
Set syslog facility to <FACILITY>.
Default: ``daemon``
HTTP
~~~~
.. option:: --add-x-forwarded-for
Append X-Forwarded-For header field to the downstream
request.
.. option:: --strip-incoming-x-forwarded-for
Strip X-Forwarded-For header field from inbound client
requests.
.. option:: --add-forwarded=<LIST>
Append RFC 7239 Forwarded header field with parameters
specified in comma delimited list <LIST>. The supported
parameters are "by", "for", "host", and "proto". By
default, the value of "by" and "for" parameters are
obfuscated string. See :option:`--forwarded-by` and
:option:`--forwarded-for` options respectively. Note that nghttpx
does not translate non-standard X-Forwarded-\* header
fields into Forwarded header field, and vice versa.
.. option:: --strip-incoming-forwarded
Strip Forwarded header field from inbound client
requests.
.. option:: --forwarded-by=(obfuscated|ip|<VALUE>)
Specify the parameter value sent out with "by" parameter
of Forwarded header field. If "obfuscated" is given,
the string is randomly generated at startup. If "ip" is
given, the interface address of the connection,
including port number, is sent with "by" parameter. In
case of UNIX domain socket, "localhost" is used instead
of address and port. User can also specify the static
obfuscated string. The limitation is that it must start
with "_", and only consists of character set
[A-Za-z0-9._-], as described in RFC 7239.
Default: ``obfuscated``
.. option:: --forwarded-for=(obfuscated|ip)
Specify the parameter value sent out with "for"
parameter of Forwarded header field. If "obfuscated" is
given, the string is randomly generated for each client
connection. If "ip" is given, the remote client address
of the connection, without port number, is sent with
"for" parameter. In case of UNIX domain socket,
"localhost" is used instead of address.
Default: ``obfuscated``
.. option:: --no-via
Don't append to Via header field. If Via header field
is received, it is left unaltered.
.. option:: --no-location-rewrite
Don't rewrite location header field in default mode.
When :option:`--http2-proxy` is used, location header field will
not be altered regardless of this option.
.. option:: --host-rewrite
Rewrite host and :authority header fields in default
mode. When :option:`--http2-proxy` is used, these headers will
not be altered regardless of this option.
.. option:: --altsvc=<PROTOID,PORT[,HOST,[ORIGIN]]>
Specify protocol ID, port, host and origin of
alternative service. <HOST> and <ORIGIN> are optional.
They are advertised in alt-svc header field only in
HTTP/1.1 frontend. This option can be used multiple
times to specify multiple alternative services.
Example: :option:`--altsvc`\=h2,443
.. option:: --add-request-header=<HEADER>
Specify additional header field to add to request header
set. This option just appends header field and won't
replace anything already set. This option can be used
several times to specify multiple header fields.
Example: :option:`--add-request-header`\="foo: bar"
.. option:: --add-response-header=<HEADER>
Specify additional header field to add to response
header set. This option just appends header field and
won't replace anything already set. This option can be
used several times to specify multiple header fields.
Example: :option:`--add-response-header`\="foo: bar"
.. option:: --request-header-field-buffer=<SIZE>
Set maximum buffer size for incoming HTTP request header
field list. This is the sum of header name and value in
bytes. If trailer fields exist, they are counted
towards this number.
Default: ``64K``
.. option:: --max-request-header-fields=<N>
Set maximum number of incoming HTTP request header
fields. If trailer fields exist, they are counted
towards this number.
Default: ``100``
.. option:: --response-header-field-buffer=<SIZE>
Set maximum buffer size for incoming HTTP response
header field list. This is the sum of header name and
value in bytes. If trailer fields exist, they are
counted towards this number.
Default: ``64K``
.. option:: --max-response-header-fields=<N>
Set maximum number of incoming HTTP response header
fields. If trailer fields exist, they are counted
towards this number.
Default: ``500``
.. option:: --error-page=(<CODE>|*)=<PATH>
Set file path to custom error page served when nghttpx
originally generates HTTP error status code <CODE>.
<CODE> must be greater than or equal to 400, and at most
599. If "\*" is used instead of <CODE>, it matches all
HTTP status code. If error status code comes from
backend server, the custom error pages are not used.
.. option:: --server-name=<NAME>
Change server response header field value to <NAME>.
Default: ``nghttpx nghttp2/1.16.0-DEV``
.. option:: --no-server-rewrite
Don't rewrite server header field in default mode. When
:option:`--http2-proxy` is used, these headers will not be altered
regardless of this option.
API
~~~
.. option:: --api-max-request-body=<SIZE>
Set the maximum size of request body for API request.
Default: ``16K``
Debug
~~~~~
.. option:: --frontend-http2-dump-request-header=<PATH>
Dumps request headers received by HTTP/2 frontend to the
file denoted in <PATH>. The output is done in HTTP/1
header field format and each header block is followed by
an empty line. This option is not thread safe and MUST
NOT be used with option :option:`-n`\<N>, where <N> >= 2.
.. option:: --frontend-http2-dump-response-header=<PATH>
Dumps response headers sent from HTTP/2 frontend to the
file denoted in <PATH>. The output is done in HTTP/1
header field format and each header block is followed by
an empty line. This option is not thread safe and MUST
NOT be used with option :option:`-n`\<N>, where <N> >= 2.
.. option:: -o, --frontend-frame-debug
Print HTTP/2 frames in frontend to stderr. This option
is not thread safe and MUST NOT be used with option
:option:`-n`\=N, where N >= 2.
Process
~~~~~~~
.. option:: -D, --daemon
Run in a background. If :option:`-D` is used, the current working
directory is changed to '*/*'.
.. option:: --pid-file=<PATH>
Set path to save PID of this program.
.. option:: --user=<USER>
Run this program as <USER>. This option is intended to
be used to drop root privileges.
Scripting
~~~~~~~~~
.. option:: --mruby-file=<PATH>
Set mruby script file
Misc
~~~~
.. option:: --conf=<PATH>
Load configuration from <PATH>.
Default: ``/etc/nghttpx/nghttpx.conf``
.. option:: --include=<PATH>
Load additional configurations from <PATH>. File <PATH>
is read when configuration parser encountered this
option. This option can be used multiple times, or even
recursively.
.. option:: -v, --version
Print version and exit.
.. option:: -h, --help
Print this help and exit.
The <SIZE> argument is an integer and an optional unit (e.g., 10K is
10 * 1024). Units are K, M and G (powers of 1024).
The <DURATION> argument is an integer and an optional unit (e.g., 1s
is 1 second and 500ms is 500 milliseconds). Units are h, m, s or ms
(hours, minutes, seconds and milliseconds, respectively). If a unit
is omitted, a second is used as unit.
FILES
-----
*/etc/nghttpx/nghttpx.conf*
The default configuration file path nghttpx searches at startup.
The configuration file path can be changed using :option:`--conf`
option.
Those lines which are staring ``#`` are treated as comment.
The option name in the configuration file is the long command-line
option name with leading ``--`` stripped (e.g., ``frontend``). Put
``=`` between option name and value. Don't put extra leading or
trailing spaces.
When specifying arguments including characters which have special
meaning to a shell, we usually use quotes so that shell does not
interpret them. When writing this configuration file, quotes for
this purpose must not be used. For example, specify additional
request header field, do this:
.. code-block:: text
add-request-header=foo: bar
instead of:
.. code-block:: text
add-request-header="foo: bar"
The options which do not take argument in the command-line *take*
argument in the configuration file. Specify ``yes`` as an argument
(e.g., ``http2-proxy=yes``). If other string is given, it is
ignored.
To specify private key and certificate file which are given as
positional arguments in command-line, use ``private-key-file`` and
``certificate-file``.
:option:`--conf` option cannot be used in the configuration file and
will be ignored if specified.
SIGNALS
-------
SIGQUIT
Shutdown gracefully. First accept pending connections and stop
accepting connection. After all connections are handled, nghttpx
exits.
SIGHUP
Reload configuration file given in :option:`--conf`.
SIGUSR1
Reopen log files.
SIGUSR2
Fork and execute nghttpx. It will execute the binary in the same
path with same command-line arguments and environment variables.
After new process comes up, sending SIGQUIT to the original process
to perform hot swapping. The difference between SIGUSR2 + SIGQUIT
and SIGHUP is that former is usually used to execute new binary, and
the master process is newly spawned. On the other hand, the latter
just reloads configuration file, and the same master process
continues to exist.
.. note::
nghttpx consists of multiple processes: one process for processing
these signals, and another one for processing requests. The former
spawns the latter. The former is called master process, and the
latter is called worker process. If neverbleed is enabled, the
worker process spawns neverbleed daemon process which does RSA key
processing. The above signal must be sent to the master process.
If the other processes received one of them, it is ignored. This
behaviour of these processes may change in the future release. In
other words, in the future release, the processes other than master
process may terminate upon the reception of these signals.
Therefore these signals should not be sent to the processes other
than master process.
SERVER PUSH
-----------
nghttpx supports HTTP/2 server push in default mode with Link header
field. nghttpx looks for Link header field (`RFC 5988
<http://tools.ietf.org/html/rfc5988>`_) in response headers from
backend server and extracts URI-reference with parameter
``rel=preload`` (see `preload
<http://w3c.github.io/preload/#interoperability-with-http-link-header>`_)
and pushes those URIs to the frontend client. Here is a sample Link
header field to initiate server push:
.. code-block:: text
Link: </fonts/font.woff>; rel=preload
Link: </css/theme.css>; rel=preload
Currently, the following restriction is applied for server push:
1. The associated stream must have method "GET" or "POST". The
associated stream's status code must be 200.
This limitation may be loosened in the future release.
nghttpx also supports server push if both frontend and backend are
HTTP/2 in default mode. In this case, in addition to server push via
Link header field, server push from backend is forwarded to frontend
HTTP/2 session.
HTTP/2 server push will be disabled if :option:`--http2-proxy` is
used.
UNIX DOMAIN SOCKET
------------------
nghttpx supports UNIX domain socket with a filename for both frontend
and backend connections.
Please note that current nghttpx implementation does not delete a
socket with a filename. And on start up, if nghttpx detects that the
specified socket already exists in the file system, nghttpx first
deletes it. However, if SIGUSR2 is used to execute new binary and
both old and new configurations use same filename, new binary does not
delete the socket and continues to use it.
OCSP STAPLING
-------------
OCSP query is done using external Python script
``fetch-ocsp-response``, which has been originally developed in Perl
as part of h2o project (https://github.com/h2o/h2o), and was
translated into Python.
The script file is usually installed under
``$(prefix)/share/nghttp2/`` directory. The actual path to script can
be customized using :option:`--fetch-ocsp-response-file` option.
If OCSP query is failed, previous OCSP response, if any, is continued
to be used.
TLS SESSION RESUMPTION
----------------------
nghttpx supports TLS session resumption through both session ID and
session ticket.
SESSION ID RESUMPTION
~~~~~~~~~~~~~~~~~~~~~
By default, session ID is shared by all worker threads.
If :option:`--tls-session-cache-memcached` is given, nghttpx will
insert serialized session data to memcached with
``nghttpx:tls-session-cache:`` + lowercased hex string of session ID
as a memcached entry key, with expiry time 12 hours. Session timeout
is set to 12 hours.
By default, connections to memcached server are not encrypted. To
enable encryption, use ``tls`` keyword in
:option:`--tls-session-cache-memcached` option.
TLS SESSION TICKET RESUMPTION
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
By default, session ticket is shared by all worker threads. The
automatic key rotation is also enabled by default. Every an hour, new
encryption key is generated, and previous encryption key becomes
decryption only key. We set session timeout to 12 hours, and thus we
keep at most 12 keys.
If :option:`--tls-ticket-key-memcached` is given, encryption keys are
retrieved from memcached. nghttpx just reads keys from memcached; one
has to deploy key generator program to update keys frequently (e.g.,
every 1 hour). The example key generator tlsticketupdate.go is
available under contrib directory in nghttp2 archive. The memcached
entry key is ``nghttpx:tls-ticket-key``. The data format stored in
memcached is the binary format described below:
.. code-block:: text
+--------------+-------+----------------+
| VERSION (4) |LEN (2)|KEY(48 or 80) ...
+--------------+-------+----------------+
^ |
| |
+------------------------+
(LEN, KEY) pair can be repeated
All numbers in the above figure is bytes. All integer fields are
network byte order.
First 4 bytes integer VERSION field, which must be 1. The 2 bytes
integer LEN field gives the length of following KEY field, which
contains key. If :option:`--tls-ticket-key-cipher`\=aes-128-cbc is
used, LEN must be 48. If
:option:`--tls-ticket-key-cipher`\=aes-256-cbc is used, LEN must be
80. LEN and KEY pair can be repeated multiple times to store multiple
keys. The key appeared first is used as encryption key. All the
remaining keys are used as decryption only.
By default, connections to memcached server are not encrypted. To
enable encryption, use ``tls`` keyword in
:option:`--tls-ticket-key-memcached` option.
If :option:`--tls-ticket-key-file` is given, encryption key is read
from the given file. In this case, nghttpx does not rotate key
automatically. To rotate key, one has to restart nghttpx (see
SIGNALS).
CERTIFICATE TRANSPARENCY
------------------------
nghttpx supports TLS ``signed_certificate_timestamp`` extension (`RFC
6962 <https://tools.ietf.org/html/rfc6962>`_). The relevant options
are :option:`--tls-sct-dir` and ``sct-dir`` parameter in
:option:`--subcert`. They takes a directory, and nghttpx reads all
files whose extension is ``.sct`` under the directory. The ``*.sct``
files are encoded as ``SignedCertificateTimestamp`` struct described
in `section 3.2 of RFC 69662
<https://tools.ietf.org/html/rfc6962#section-3.2>`_. This format is
the same one used by `nginx-ct
<https://github.com/grahamedgecombe/nginx-ct>`_ and `mod_ssl_ct
<https://httpd.apache.org/docs/trunk/mod/mod_ssl_ct.html>`_.
`ct-submit <https://github.com/grahamedgecombe/ct-submit>`_ can be
used to submit certificates to log servers, and obtain the
``SignedCertificateTimestamp`` struct which can be used with nghttpx.
MRUBY SCRIPTING
---------------
.. warning::
The current mruby extension API is experimental and not frozen. The
API is subject to change in the future release.
nghttpx allows users to extend its capability using mruby scripts.
nghttpx has 2 hook points to execute mruby script: request phase and
response phase. The request phase hook is invoked after all request
header fields are received from client. The response phase hook is
invoked after all response header fields are received from backend
server. These hooks allows users to modify header fields, or common
HTTP variables, like authority or request path, and even return custom
response without forwarding request to backend servers.
To specify mruby script file, use :option:`--mruby-file` option. The
script will be evaluated once per thread on startup, and it must
instantiate object and evaluate it as the return value (e.g.,
``App.new``). This object is called app object. If app object
defines ``on_req`` method, it is called with :rb:class:`Nghttpx::Env`
object on request hook. Similarly, if app object defines ``on_resp``
method, it is called with :rb:class:`Nghttpx::Env` object on response
hook. For each method invocation, user can can access
:rb:class:`Nghttpx::Request` and :rb:class:`Nghttpx::Response` objects
via :rb:attr:`Nghttpx::Env#req` and :rb:attr:`Nghttpx::Env#resp`
respectively.
.. rb:module:: Nghttpx
.. rb:const:: REQUEST_PHASE
Constant to represent request phase.
.. rb:const:: RESPONSE_PHASE
Constant to represent response phase.
.. rb:class:: Env
Object to represent current request specific context.
.. rb:attr_reader:: req
Return :rb:class:`Request` object.
.. rb:attr_reader:: resp
Return :rb:class:`Response` object.
.. rb:attr_reader:: ctx
Return Ruby hash object. It persists until request finishes.
So values set in request phase hoo can be retrieved in
response phase hook.
.. rb:attr_reader:: phase
Return the current phase.
.. rb:attr_reader:: remote_addr
Return IP address of a remote client. If connection is made
via UNIX domain socket, this returns the string "localhost".
.. rb:attr_reader:: server_addr
Return address of server that accepted the connection. This
is a string which specified in :option:`--frontend` option,
excluding port number, and not a resolved IP address. For
UNIX domain socket, this is a path to UNIX domain socket.
.. rb:attr_reader:: server_port
Return port number of the server frontend which accepted the
connection from client.
.. rb:attr_reader:: tls_used
Return true if TLS is used on the connection.
.. rb:attr_reader:: tls_sni
Return the TLS SNI value which client sent in this connection.
.. rb:class:: Request
Object to represent request from client. The modification to
Request object is allowed only in request phase hook.
.. rb:attr_reader:: http_version_major
Return HTTP major version.
.. rb:attr_reader:: http_version_minor
Return HTTP minor version.
.. rb:attr_accessor:: method
HTTP method. On assignment, copy of given value is assigned.
We don't accept arbitrary method name. We will document them
later, but well known methods, like GET, PUT and POST, are all
supported.
.. rb:attr_accessor:: authority
Authority (i.e., example.org), including optional port
component . On assignment, copy of given value is assigned.
.. rb:attr_accessor:: scheme
Scheme (i.e., http, https). On assignment, copy of given
value is assigned.
.. rb:attr_accessor:: path
Request path, including query component (i.e., /index.html).
On assignment, copy of given value is assigned. The path does
not include authority component of URI. This may include
query component. nghttpx makes certain normalization for
path. It decodes percent-encoding for unreserved characters
(see https://tools.ietf.org/html/rfc3986#section-2.3), and
resolves ".." and ".". But it may leave characters which
should be percent-encoded as is. So be careful when comparing
path against desired string.
.. rb:attr_reader:: headers
Return Ruby hash containing copy of request header fields.
Changing values in returned hash does not change request
header fields actually used in request processing. Use
:rb:meth:`Nghttpx::Request#add_header` or
:rb:meth:`Nghttpx::Request#set_header` to change request
header fields.
.. rb:method:: add_header(key, value)
Add header entry associated with key. The value can be single
string or array of string. It does not replace any existing
values associated with key.
.. rb:method:: set_header(key, value)
Set header entry associated with key. The value can be single
string or array of string. It replaces any existing values
associated with key.
.. rb:method:: clear_headers
Clear all existing request header fields.
.. rb:method:: push(uri)
Initiate to push resource identified by *uri*. Only HTTP/2
protocol supports this feature. For the other protocols, this
method is noop. *uri* can be absolute URI, absolute path or
relative path to the current request. For absolute or
relative path, scheme and authority are inherited from the
current request. Currently, method is always GET. nghttpx
will issue request to backend servers to fulfill this request.
The request and response phase hooks will be called for pushed
resource as well.
.. rb:class:: Response
Object to represent response from backend server.
.. rb:attr_reader:: http_version_major
Return HTTP major version.
.. rb:attr_reader:: http_version_minor
Return HTTP minor version.
.. rb:attr_accessor:: status
HTTP status code. It must be in the range [200, 999],
inclusive. The non-final status code is not supported in
mruby scripting at the moment.
.. rb:attr_reader:: headers
Return Ruby hash containing copy of response header fields.
Changing values in returned hash does not change response
header fields actually used in response processing. Use
:rb:meth:`Nghttpx::Response#add_header` or
:rb:meth:`Nghttpx::Response#set_header` to change response
header fields.
.. rb:method:: add_header(key, value)
Add header entry associated with key. The value can be single
string or array of string. It does not replace any existing
values associated with key.
.. rb:method:: set_header(key, value)
Set header entry associated with key. The value can be single
string or array of string. It replaces any existing values
associated with key.
.. rb:method:: clear_headers
Clear all existing response header fields.
.. rb:method:: return(body)
Return custom response *body* to a client. When this method
is called in request phase hook, the request is not forwarded
to the backend, and response phase hook for this request will
not be invoked. When this method is called in response phase
hook, response from backend server is canceled and discarded.
The status code and response header fields should be set
before using this method. To set status code, use :rb:meth To
set response header fields, use
:rb:attr:`Nghttpx::Response#status`. If status code is not
set, 200 is used. :rb:meth:`Nghttpx::Response#add_header` and
:rb:meth:`Nghttpx::Response#set_header`. When this method is
invoked in response phase hook, the response headers are
filled with the ones received from backend server. To send
completely custom header fields, first call
:rb:meth:`Nghttpx::Response#clear_headers` to erase all
existing header fields, and then add required header fields.
It is an error to call this method twice for a given request.
MRUBY EXAMPLES
~~~~~~~~~~~~~~
Modify request path:
.. code-block:: ruby
class App
def on_req(env)
env.req.path = "/apps#{env.req.path}"
end
end
App.new
Don't forget to instantiate and evaluate object at the last line.
Restrict permission of viewing a content to a specific client
addresses:
.. code-block:: ruby
class App
def on_req(env)
allowed_clients = ["127.0.0.1", "::1"]
if env.req.path.start_with?("/log/") &&
!allowed_clients.include?(env.remote_addr) then
env.resp.status = 404
env.resp.return "permission denied"
end
end
end
App.new
API ENDPOINTS
-------------
nghttpx exposes API endpoints to manipulate it via HTTP based API. By
default, API endpoint is disabled. To enable it, add a dedicated
frontend for API using :option:`--frontend` option with "api"
parameter. All requests which come from this frontend address, will
be treated as API request.
The response is normally JSON dictionary, and at least includes the
following keys:
status
The status of the request processing. The following values are
defined:
Success
The request was successful.
Failure
The request was failed. No change has been made.
code
HTTP status code
We wrote "normally", since nghttpx may return ordinal HTML response in
some cases where the error has occurred before reaching API endpoint
(e.g., header field is too large).
The following section describes available API endpoints.
PUT /api/v1beta1/backendconfig
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This API replaces the current backend server settings with the
requested ones. The request method should be PUT, but POST is also
acceptable. The request body must be nghttpx configuration file
format. For configuration file format, see `FILES`_ section. The
line separator inside the request body must be single LF (0x0A).
Currently, only :option:`backend <--backend>` option is parsed, the
others are simply ignored. The semantics of this API is replace the
current backend with the backend options in request body. Describe
the desired set of backend severs, and nghttpx makes it happen. If
there is no :option:`backend <--backend>` option is found in request
body, the current set of backend is replaced with the :option:`backend
<--backend>` option's default value, which is ``127.0.0.1,80``.
The replacement is done instantly without breaking existing
connections or requests. It also avoids any process creation as is
the case with hot swapping with signals.
The one limitation is that only numeric IP address is allowd in
:option:`backend <--backend>` in request body while non numeric
hostname is allowed in command-line or configuration file is read
using :option:`--conf`.
SEE ALSO
--------
:manpage:`nghttp(1)`, :manpage:`nghttpd(1)`, :manpage:`h2load(1)`
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