This commit adds configuration revision, which is considered opaque
string, and changes after reloading configuration with SIGHUP. This
revision is returned as a response to configrevision API endpoint.
This allows external application to know whether nghttpx has finished
reloading new configuration or not. Note that this revision does not
change on backendconfig API calls.
This commit removes frontend-tls parameter, and adds
redirect-if-not-tls parameter parameter to --backend option. nghttpx
now responds to the request with 308 status code to redirect the
request to https URI if frontend connection is not TLS encrypted, and
redirect-if-no-tls parameter is used in --backend option. The port
number in Location header field is 443 by default (thus omitted), but
it can be configurable using --redirect-https-port option.
This commit deprecates --tls-proto-list option, and adds 2 new
options: --tls-min-proto-version and --tls-max-proto-version to
specify minimum and maximum protocol version respectively. Versions
between the two are enabled. The deprecated --tls-proto-list has
empty default value, and acts like enabling only specific protocol
versions in the range for now.
--accesslog-write-early option is analogous to HAProxy's logasap. If
used, nghttpx writes access log when response header fields are
received from backend rather than when request transaction finishes.
Previously, ciphers option sets cipher list for both frontend and
backend TLS connections. With this commit, ciphers option only sets
cipher list for frontend connections. The new client-ciphers option
sets cipher list for backend connection.
This commit adds client-no-http2-cipher-black-list option to disable
enforcement of HTTP/2 cipher black list on backend HTTP/2 connection.
Previously, existing no-http2-cipher-black-list option disables it for
both frontend and backend connections. Now no-http2-cipher-black-list
option only disables it for frontend connection.
Previously, global accept-proxy-protocol option enables PROXY protocol
support for all frontend listeners, but this was inflexible. To fix
this issue, accept-proxy-protocol option is now deprecated, and
instead proxyproto parameter in frontend option enables PROXY protocol
support per frontend.
We have added "dns" parameter to backend option. If specified, name
lookup is done dynamically. If not, name lookup is done at start up,
or configuration reloading. nghttpx caches DNS result including error
case in 30 seconds in this commit. Later commit makes this
configurable.
DNS resolution is done asynchronously using c-ares library.
This option requires OpenSSL >= 1.0.2. With OpenSSL 1.0.2, the
default value is "P-256". With OpenSSL 1.1.0 or later, the default
value is "X25519:P-256".
We added --frontend-http2-window-size,
--frontend-http2-connection-window-size, --backend-http2-window-size,
and --backend-http2-connection-window-size option to replace existing
*-bits options. The old options are not flexible because they only
specify number of bits. Now we can specify integer value, with
possible g, m, and k unit. The old options are still available for
backend compatibility, but are deprecated.
std::make_shared in Xcode 7, 7.1, and 7.2 does not perform
value-initialization, and causes undefined behaviour if struct does
not have user defined default constructor. This workaround explicitly
defines user defined default constructor, and initializes values.
This commit implements configuration reloading with SIGHUP.
There are rough edges left:
* Rename SignalServer with more meaningful name, say, WorkerProcess.
* We should introduce global configuration object which is not
affected by configuration reloading. It should hold cmdcfgs, argc,
argv, and last worker PID.
* We should close the listener file descriptor when some operation was
failed after that.
Some API processing is very slow (e.g., getaddrinfo). To avoid to
slow down regular request handling, if multi threaded configuration is
enabled, we allocate dedicated worker for API.
Tatsuhiro Tsujikawa