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<li class="toctree-l2"><a class="reference internal" href="#default-mode">Default mode</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#http-2-proxy-mode">HTTP/2 proxy mode</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#disable-ssl-tls">Disable SSL/TLS</a></li>
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<li class="toctree-l2"><a class="reference internal" href="#specifying-additional-ca-certificate">Specifying additional CA certificate</a></li>
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<div class="section" id="nghttpx-how-to">
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<h1>nghttpx - HOW-TO<a class="headerlink" href="#nghttpx-how-to" title="Permalink to this headline">¶</a></h1>
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<p>nghttpx is a proxy translating protocols between HTTP/2 and other
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protocols (e.g., HTTP/1, SPDY). It operates in several modes and each
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mode may require additional programs to work with. This article
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describes each operation mode and explains the intended use-cases. It
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also covers some useful options later.</p>
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<div class="section" id="default-mode">
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<h2>Default mode<a class="headerlink" href="#default-mode" title="Permalink to this headline">¶</a></h2>
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<p>If nghttpx is invoked without any <tt class="docutils literal"><span class="pre">-s</span></tt>, <tt class="docutils literal"><span class="pre">-p</span></tt> and <tt class="docutils literal"><span class="pre">--client</span></tt>, it
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operates in default mode. In this mode, nghttpx frontend listens for
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HTTP/2 requests and translates them to HTTP/1 requests. Thus it works
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as reverse proxy (gateway) for HTTP/2 clients to HTTP/1 web server.
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HTTP/1 requests are also supported in frontend as a fallback. If
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nghttpx is linked with spdylay library and frontend connection is
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SSL/TLS, the frontend also supports SPDY protocol.</p>
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<p>By default, this mode’s frontend connection is encrypted using
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SSL/TLS. So server’s private key and certificate must be supplied to
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the command line (or through configuration file). In this case, the
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fontend protocol selection will is done via ALPN or NPN.</p>
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<p>With <tt class="docutils literal"><span class="pre">--frontend-no-tls</span></tt> option, user can turn off SSL/TLS in
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frontend connection. In this case, SPDY protocol is not available
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even if spdylay library is liked to nghttpx. HTTP/2 and HTTP/1 are
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available on the frontend and a HTTP/1 connection can be upgraded to
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HTTP/2 using HTTP Upgrade. Starting HTTP/2 connection by sending
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HTTP/2 connection preface is also supported.</p>
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<p>The backend is supposed to be HTTP/1 Web server. For example, to make
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nghttpx listen to encrypted HTTP/2 requests at port 8443, and a
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backend HTTP/1 web server is configured to listen to HTTP/1 request at
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port 8080 in the same host, run nghttpx command-line like this:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ nghttpx -f0.0.0.0,8443 -b127.0.0.1,8080 /path/to/server.key /path/to/server.crt
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</pre></div>
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</div>
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<p>Then HTTP/2 enabled client can access to the nghttpx in HTTP/2. For
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example, you can send GET request to the server using nghttp:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ nghttp -nv https://localhost:8443/
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</pre></div>
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</div>
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</div>
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<div class="section" id="http-2-proxy-mode">
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<h2>HTTP/2 proxy mode<a class="headerlink" href="#http-2-proxy-mode" title="Permalink to this headline">¶</a></h2>
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<p>If nghttpx is invoked with <tt class="docutils literal"><span class="pre">-s</span></tt> option, it operates in HTTP/2 proxy
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mode. The supported protocols in frontend and backend connections are
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the same in <a class="reference internal" href="#default-mode">default mode</a>. The difference is that this mode acts like
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forward proxy and assumes the backend is HTTP/1 proxy server (e.g.,
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squid). So HTTP/1 request must include absolute URI in request line.</p>
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<p>By default, frontend connection is encrypted, this mode is also called
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secure proxy. If nghttpx is linked with spdylay, it supports SPDY
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protocols and it works as so called SPDY proxy.</p>
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<p>With <tt class="docutils literal"><span class="pre">--frontend-no-tls</span></tt> option, SSL/TLS is turned off in frontend
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connection, so the connection gets insecure.</p>
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<p>The backend must be HTTP/1 proxy server. nghttpx only supports 1
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backend server address. It translates incoming requests to HTTP/1
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request to backend server. The backend server performs real proxy
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work for each request, for example, dispatching requests to the origin
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server and caching contents.</p>
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<p>For example, to make nghttpx listen to encrypted HTTP/2 requests at
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port 8443, and a backend HTTP/1 proxy server is configured to listen
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to HTTP/1 request at port 3128 in the same host, run nghttpx
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command-line like this:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ nghttpx -s -f0.0.0.0,8443 -b127.0.0.1,3128 /path/to/server.key /path/to/server.crt
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</pre></div>
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</div>
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<p>At the time of this writing, there is no known HTTP/2 client which
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supports HTTP/2 proxy in this fashion. You can use Google Chrome to
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use this as secure (SPDY) proxy to test it out, though it does not use
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HTTP/2 at all.</p>
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<p>The one way to configure Google Chrome to use secure proxy is create
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proxy.pac script like this:</p>
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<div class="highlight-javascript"><div class="highlight"><pre><span class="kd">function</span> <span class="nx">FindProxyForURL</span><span class="p">(</span><span class="nx">url</span><span class="p">,</span> <span class="nx">host</span><span class="p">)</span> <span class="p">{</span>
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<span class="k">return</span> <span class="s2">"HTTPS SERVERADDR:PORT"</span><span class="p">;</span>
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<span class="p">}</span>
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</pre></div>
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</div>
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<p><tt class="docutils literal"><span class="pre">SERVERADDR</span></tt> and <tt class="docutils literal"><span class="pre">PORT</span></tt> is the hostname/address and port of the
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machine nghttpx is running. Please note that Google Chrome requires
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valid certificate for secure proxy.</p>
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<p>Then run Google Chrome with the following arguments:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ google-chrome --proxy-pac-url=file:///path/to/proxy.pac --use-npn
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</pre></div>
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</div>
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</div>
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<div class="section" id="client-mode">
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<h2>Client mode<a class="headerlink" href="#client-mode" title="Permalink to this headline">¶</a></h2>
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<p>If nghttpx is invoked with <tt class="docutils literal"><span class="pre">--client</span></tt> option, it operates in client
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mode. In this mode, nghttpx listens for plain, unencrypted HTTP/2 and
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HTTP/1 requests and translates them to encrypted HTTP/2 requests to
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the backend. User cannot enable SSL/TLS in frontend connection.</p>
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<p>HTTP/1 frontend connection can be upgraded to HTTP/2 using HTTP
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Upgrade. To disable SSL/TLS in backend connection, use
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<tt class="docutils literal"><span class="pre">--backend-no-tls</span></tt> option.</p>
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<p>The backend connection is created one per worker (thread).</p>
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<p>The backend server is supporsed to be a HTTP/2 web server (e.g.,
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nghttpd). The one use-case of this mode is utilize existing HTTP/1
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clients to test HTTP/2 deployment. Suppose that HTTP/2 web server
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listens to port 80 without encryption. Then run nghttpx as client
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mode to access to that web server:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ nghttpx --client -f127.0.0.1,8080 -b127.0.0.1,80 --backend-no-tls
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</pre></div>
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</div>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">You may need <tt class="docutils literal"><span class="pre">-k</span></tt> option if HTTP/2 server enables SSL/TLS and
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its certificate is self-signed. But please note that it is
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insecure.</p>
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</div>
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<p>Then you can use curl to access HTTP/2 server via nghttpx:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ curl http://localhost:8080/
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</pre></div>
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</div>
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</div>
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<div class="section" id="client-proxy-mode">
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<h2>Client proxy mode<a class="headerlink" href="#client-proxy-mode" title="Permalink to this headline">¶</a></h2>
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<p>If nghttpx is invoked with <tt class="docutils literal"><span class="pre">-p</span></tt> option, it operates in client proxy
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mode. This mode behaves like <a class="reference internal" href="#client-mode">client mode</a>, but it works like
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forward proxy. So HTTP/1 request must include absolute URI in request
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line.</p>
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<p>HTTP/1 frontend connection can be upgraded to HTTP/2 using HTTP
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Upgrade. To disable SSL/TLS in backend connection, use
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<tt class="docutils literal"><span class="pre">--backend-no-tls</span></tt> option.</p>
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<p>The backend connection is created one per worker (thread).</p>
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<p>The backend server must be a HTTP/2 proxy. You can use nghttpx in
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<a class="reference internal" href="#http-2-proxy-mode">HTTP/2 proxy mode</a> as backend server. The one use-case of this mode
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is utilize existing HTTP/1 clients to test HTTP/2 connections between
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2 proxies. The another use-case is use this mode to aggregate local
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HTTP/1 connections to one HTTP/2 backend encrypted connection. This
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makes HTTP/1 clients which does not support secure proxy can use
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secure HTTP/2 proxy via nghttpx client mode.</p>
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<p>Suppose that HTTP/2 proxy listens to port 8443, just like we saw in
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<a class="reference internal" href="#http-2-proxy-mode">HTTP/2 proxy mode</a>. To run nghttpx in client proxy mode to access
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that server, invoke nghttpx like this:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ nghttpx -p -f127.0.0.1,8080 -b127.0.0.1,8443
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</pre></div>
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</div>
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<div class="admonition note">
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<p class="first admonition-title">Note</p>
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<p class="last">You may need <tt class="docutils literal"><span class="pre">-k</span></tt> option if HTTP/2 server’ss certificate is
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self-signed. But please note that it is insecure.</p>
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</div>
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<p>Then you can use curl to issue HTTP request via HTTP/2 proxy:</p>
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<div class="highlight-c"><div class="highlight"><pre>$ curl --http-proxy=http://localhost:8080 http://www.google.com/
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</pre></div>
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</div>
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<p>You can configure web browser to use localhost:8080 as forward
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proxy.</p>
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</div>
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<div class="section" id="http-2-bridge-mode">
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<h2>HTTP/2 bridge mode<a class="headerlink" href="#http-2-bridge-mode" title="Permalink to this headline">¶</a></h2>
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<p>If nghttpx is invoked with <tt class="docutils literal"><span class="pre">--http2-bridge</span></tt> option, it operates in
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HTTP/2 bridge mode. The supported protocols in frontend and backend
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connections are the same in <a class="reference internal" href="#default-mode">default mode</a>.</p>
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<p>With <tt class="docutils literal"><span class="pre">--frontend-no-tls</span></tt> option, SSL/TLS is turned off in frontend
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connection, so the connection gets insecure.</p>
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<p>The backend server is supporsed to be a HTTP/2 web server or HTTP/2
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proxy. Since HTTP/2 requests opaque between proxied and non-proxied
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request, the backend server may be proxy or just web server depending
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on the context of incoming requests.</p>
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<p>The use-case of this mode is aggregate the incoming connections to one
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HTTP/2 connection. One backend HTTP/2 connection is created per
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worker (thread).</p>
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</div>
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<div class="section" id="disable-ssl-tls">
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<h2>Disable SSL/TLS<a class="headerlink" href="#disable-ssl-tls" title="Permalink to this headline">¶</a></h2>
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<p>In <a class="reference internal" href="#default-mode">default mode</a>, <a class="reference internal" href="#http-2-proxy-mode">HTTP/2 proxy mode</a> and <a class="reference internal" href="#http-2-bridge-mode">HTTP/2 bridge mode</a>,
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frontend connections are encrypted with SSL/TLS by default. To turn
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off SSL/TLS, use <tt class="docutils literal"><span class="pre">--frontend-no-tls</span></tt> option. If this option is
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used, the private key and certificate are not required to run nghttpx.</p>
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<p>In <a class="reference internal" href="#client-mode">client mode</a>, <a class="reference internal" href="#client-proxy-mode">client proxy mode</a> and <a class="reference internal" href="#http-2-bridge-mode">HTTP/2 bridge mode</a>,
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backend connections are encrypted with SSL/TLS by default. To turn
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off SSL/TLS, use <tt class="docutils literal"><span class="pre">--backend-no-tls</span></tt> option.</p>
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</div>
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<div class="section" id="specifying-additional-ca-certificate">
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<h2>Specifying additional CA certificate<a class="headerlink" href="#specifying-additional-ca-certificate" title="Permalink to this headline">¶</a></h2>
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<p>By default, nghttpx tries to read CA certificate from system. But
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depending on the system you use, this may fail or is not supported.
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To specify CA certificate manually, use <tt class="docutils literal"><span class="pre">--cacert</span></tt> option. The
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specified file must be PEM format and can contain multiple
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certificates.</p>
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<p>By default, nghttpx validates server’s certificate. If you want to
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turn off this validation, knowing this is really insecure and what you
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are doing, you can use <tt class="docutils literal"><span class="pre">-k</span></tt> option to disable certificate
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validation.</p>
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</div>
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<div class="section" id="read-write-rate-limit">
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<h2>Read/write rate limit<a class="headerlink" href="#read-write-rate-limit" title="Permalink to this headline">¶</a></h2>
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<p>nghttpx supports transfer rate limiting on frontend connections. You
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can do rate limit per connection or per worker (thread) for reading
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and writeing individually.</p>
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<p>To rate limit per connection for reading, use <tt class="docutils literal"><span class="pre">--read-rate</span></tt> and
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<tt class="docutils literal"><span class="pre">--read-burst</span></tt> options. For writing, use <tt class="docutils literal"><span class="pre">--write-rate</span></tt> and
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<tt class="docutils literal"><span class="pre">--write-burst</span></tt> options.</p>
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<p>To rate limit per worker (thread), use <tt class="docutils literal"><span class="pre">--worker-read-rate</span></tt> and
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<tt class="docutils literal"><span class="pre">--worker-read-burst</span></tt> options. For writing, use
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<tt class="docutils literal"><span class="pre">--worker-write-rate</span></tt> and <tt class="docutils literal"><span class="pre">--worker-write-burst</span></tt>.</p>
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<p>If both per connection and per worker rate limit configurations are
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specified, the lower rate is used.</p>
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<p>Please note that rate limit is performed on top of TCP and nothing to
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|
do with HTTP/2 flow control.</p>
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