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<h1 id="environment-variables">Environment Variables</h1>
<p>The HTTPX library can be configured via environment variables.
Environment variables are used by default. To ignore environment variables, <code>trust_env</code> has to be set <code>False</code>. There are two ways to set <code>trust_env</code> to disable environment variables:</p>
<ul>
<li>On the client via <code>httpx.Client(trust_env=False)</code>.</li>
<li>Using the top-level API, such as <code>httpx.get("&lt;url&gt;", trust_env=False)</code>.</li>
</ul>
<p>Here is a list of environment variables that HTTPX recognizes and what function they serve:</p>
<h2 id="proxies">Proxies</h2>
<p>The environment variables documented below are used as a convention by various HTTP tooling, including:</p>
<ul>
<li><a href="https://github.com/curl/curl/blob/master/docs/MANUAL.md#environment-variables">cURL</a></li>
<li><a href="https://github.com/psf/requests/blob/master/docs/user/advanced.rst#proxies">requests</a></li>
</ul>
<p>For more information on using proxies in HTTPX, see <a href="../advanced/proxies/#http-proxying">HTTP Proxying</a>.</p>
<h3 id="http_proxy-https_proxy-all_proxy"><code>HTTP_PROXY</code>, <code>HTTPS_PROXY</code>, <code>ALL_PROXY</code></h3>
<p>Valid values: A URL to a proxy</p>
<p><code>HTTP_PROXY</code>, <code>HTTPS_PROXY</code>, <code>ALL_PROXY</code> set the proxy to be used for <code>http</code>, <code>https</code>, or all requests respectively.</p>
<div class="highlight"><pre><span></span><code><span class="nb">export</span><span class="w"> </span><span class="nv">HTTP_PROXY</span><span class="o">=</span>http://my-external-proxy.com:1234
<span class="c1"># This request will be sent through the proxy</span>
python<span class="w"> </span>-c<span class="w"> </span><span class="s2">&quot;import httpx; httpx.get(&#39;http://example.com&#39;)&quot;</span>
<span class="c1"># This request will be sent directly, as we set `trust_env=False`</span>
python<span class="w"> </span>-c<span class="w"> </span><span class="s2">&quot;import httpx; httpx.get(&#39;http://example.com&#39;, trust_env=False)&quot;</span>
</code></pre></div>
<h3 id="no_proxy"><code>NO_PROXY</code></h3>
<p>Valid values: a comma-separated list of hostnames/urls</p>
<p><code>NO_PROXY</code> disables the proxy for specific urls</p>
<div class="highlight"><pre><span></span><code><span class="nb">export</span><span class="w"> </span><span class="nv">HTTP_PROXY</span><span class="o">=</span>http://my-external-proxy.com:1234
<span class="nb">export</span><span class="w"> </span><span class="nv">NO_PROXY</span><span class="o">=</span>http://127.0.0.1,python-httpx.org
<span class="c1"># As in the previous example, this request will be sent through the proxy</span>
python<span class="w"> </span>-c<span class="w"> </span><span class="s2">&quot;import httpx; httpx.get(&#39;http://example.com&#39;)&quot;</span>
<span class="c1"># These requests will be sent directly, bypassing the proxy</span>
python<span class="w"> </span>-c<span class="w"> </span><span class="s2">&quot;import httpx; httpx.get(&#39;http://127.0.0.1:5000/my-api&#39;)&quot;</span>
python<span class="w"> </span>-c<span class="w"> </span><span class="s2">&quot;import httpx; httpx.get(&#39;https://www.python-httpx.org&#39;)&quot;</span>
</code></pre></div>
<h2 id="ssl_cert_file"><code>SSL_CERT_FILE</code></h2>
<p>Valid values: a filename</p>
<p>If this environment variable is set then HTTPX will load
CA certificate from the specified file instead of the default
location.</p>
<p>Example:</p>
<div class="highlight"><pre><span></span><code><span class="go">SSL_CERT_FILE=/path/to/ca-certs/ca-bundle.crt python -c &quot;import httpx; httpx.get(&#39;https://example.com&#39;)&quot;</span>
</code></pre></div>
<h2 id="ssl_cert_dir"><code>SSL_CERT_DIR</code></h2>
<p>Valid values: a directory following an <a href="https://www.openssl.org/docs/manmaster/man3/SSL_CTX_load_verify_locations.html">OpenSSL specific layout</a>.</p>
<p>If this environment variable is set and the directory follows an <a href="https://www.openssl.org/docs/manmaster/man3/SSL_CTX_load_verify_locations.html">OpenSSL specific layout</a> (ie. you ran <code>c_rehash</code>) then HTTPX will load CA certificates from this directory instead of the default location.</p>
<p>Example:</p>
<div class="highlight"><pre><span></span><code><span class="go">SSL_CERT_DIR=/path/to/ca-certs/ python -c &quot;import httpx; httpx.get(&#39;https://example.com&#39;)&quot;</span>
</code></pre></div>
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