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<h1 id="proxy-setup">Proxy setup<a class="headerlink" href="#proxy-setup" title="Permanent link">&para;</a></h1>
<p>In some locations Telegram Bots API urls will be unavailable. In this case all examples will just throw exception like:</p>
<pre><code class="language-bash">Exception in thread &quot;main&quot; java.net.ConnectException: Connection refused
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
at io.ktor.network.sockets.SocketImpl.connect$ktor_network(SocketImpl.kt:36)
at io.ktor.network.sockets.SocketImpl$connect$1.invokeSuspend(SocketImpl.kt)
at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:738)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
Process finished with exit code 1
</code></pre>
<p>There are several ways to solve this problem:</p>
<ul>
<li>Built-in proxy config (will require some socks or http proxy server)</li>
<li>System-configured VPN or proxy</li>
<li>Your own Bot API Server</li>
</ul>
<h3 id="using-ktor-client-built-in-proxy">Using Ktor Client built-in proxy<a class="headerlink" href="#using-ktor-client-built-in-proxy" title="Permanent link">&para;</a></h3>
<p>First of all, you will need to use one more library:</p>
<p><strong>build.gradle</strong>:</p>
<pre><code class="language-groovy">implementation &quot;io.ktor:ktor-client-okhttp:2.0.1&quot;
</code></pre>
<div class="admonition note">
<p class="admonition-title">Dependency note</p>
<p>
In the snippet above was used version <code>2.0.1</code> which is actual for <code>TelegramBotAPI</code> at the moment of filling this documentation (<code>May 22 2022</code>, <code>TelegramBotAPI</code> version <code>2.0.0</code>) and you can update version of this dependency in case if it is outdated.</p>
</div>
<p>For configuring proxy for your bot inside your program, you can use next snippet:</p>
<pre><code class="language-kotlin">val botToken = &quot;HERE MUST BE YOUR TOKEN&quot;
val bot = telegramBot(botToken) {
ktorClientEngineFactory = OkHttp
proxy = ProxyBuilder.socks(&quot;127.0.0.1&quot;, 1080)
}
</code></pre>
<p>Explanation line by line:</p>
<ol>
<li><code>val botToken = "HERE MUST BE YOUR TOKEN"</code> - here we are just creating variable <code>botToken</code></li>
<li><code>val bot = telegramBot(botToken) {</code> - start creating bot</li>
<li><code>ktorClientEngineFactory = OkHttp</code> - setting up engine factory of our bot. On the time of documentation filling, <code>OkHttp</code> is one of the engines in <code>Ktor</code> system which supports socks proxy. More you can read on <a href="https://ktor.io">Ktor</a> site in subparts about <a href="https://ktor.io/clients/http-client/engines.html#okhttp">engines</a> and <a href="https://ktor.io/clients/http-client/features/proxy.html">proxy</a></li>
<li><code>proxy = ProxyBuilder.socks("127.0.0.1", 1080)</code> - here we are setting up our proxy. Here was used local server which (as assumed) will connect to server like <code>shadowsocks</code></li>
</ol>
<h2 id="next-steps">Next steps<a class="headerlink" href="#next-steps" title="Permanent link">&para;</a></h2>
<ul>
<li><a href="first-bot.html">First bot</a></li>
</ul>
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