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WsProvider
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RPC
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Events (runtime)
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ApiPromise
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Simple connect
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Listen to blocks
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Listen to balance change
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Read chain state
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Make a transfer
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<!-- Title -->
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<h1>
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<i class="fa fa-circle-o-notch fa-spin"></i>
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<a href="../.." >HttpProvider</a>
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</h1>
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<section class="normal markdown-section">
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<h1 id="polkadotrpc-providerhttps">@polkadot/rpc-provider/https</h1>
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<p><em><strong>name</strong></em>: HttpProvider</p>
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<p><em><strong>description</strong></em>: The HTTP Provider allows sending requests using HTTP to a HTTP RPC server TCP port. It does not support subscriptions so you won't be able to listen to events such as new blocks or balance changes. It is usually preferrable using the <a href="_ws_index_.wsprovider.html">WsProvider</a>.</p>
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<p><em><strong>example</strong></em>: </p>
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<pre><code class="lang-javascript"><div class="sunlight-container sunlight-theme-gitbook"><div class="sunlight-code-container"><pre class="sunlight-highlight-javascript sunlight-highlighted"><span class="sunlight-javascript"><span class="sunlight-reservedWord">import</span> <span class="sunlight-ident">Api</span> <span class="sunlight-ident">from</span> <span class="sunlight-string">'@polkadot/api/promise'</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">import</span> <span class="sunlight-ident">HttpProvider</span> <span class="sunlight-ident">from</span> <span class="sunlight-string">'@polkadot/rpc-provider/http'</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">provider</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">HttpProvider</span><span class="sunlight-punctuation">(</span><span class="sunlight-string">'http://127.0.0.1:9933'</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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<span class="sunlight-reservedWord">const</span> <span class="sunlight-ident">api</span> <span class="sunlight-operator">=</span> <span class="sunlight-keyword">new</span> <span class="sunlight-ident">Api</span><span class="sunlight-punctuation">(</span><span class="sunlight-ident">provider</span><span class="sunlight-punctuation">)</span><span class="sunlight-punctuation">;</span>
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</span></pre></div></div></code></pre>
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<p><em><strong>see</strong></em>: <a href="_ws_index_.wsprovider.html">WsProvider</a></p>
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<h1 id="hierarchy">Hierarchy</h1>
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<p><strong>HttpProvider</strong></p>
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<h1 id="implements">Implements</h1>
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<ul>
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<li><code>ProviderInterface</code></li>
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</ul>
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<h1 id="constructors">Constructors</h1>
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<p><a id="constructor"></a></p>
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<h2 id="constructor">constructor</h2>
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<p>⊕ <strong>new HttpProvider</strong>(endpoint?: <em><code>string</code></em>): <a href="_http_index_.httpprovider.html">HttpProvider</a></p>
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<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/b09cbf6/packages/rpc-provider/src/http/index.ts#L40" target="_blank">http/index.ts:40</a></em></p>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr>
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<th>Param</th>
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<th>Type</th>
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<th>Default value</th>
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<th>Description</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td><code>Default value</code> endpoint</td>
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<td><code>string</code></td>
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<td>defaults.HTTP_URL</td>
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<td>The endpoint url starting with http://</td>
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</tr>
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</tbody>
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</table>
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<p><strong>Returns:</strong> <a href="_http_index_.httpprovider.html">HttpProvider</a></p>
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<hr>
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<h1 id="methods">Methods</h1>
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<p><a id="isconnected"></a></p>
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<h2 id="isconnected">isConnected</h2>
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<p>▸ <strong>isConnected</strong>(): <code>boolean</code></p>
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<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/b09cbf6/packages/rpc-provider/src/http/index.ts#L56" target="_blank">http/index.ts:56</a></em></p>
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<p><em><strong>summary</strong></em>: Whether the node is connected or not.</p>
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<p><strong>Returns:</strong> <code>boolean</code>
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true if connected</p>
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<hr>
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<p><a id="on"></a></p>
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<h2 id="on">on</h2>
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<p>▸ <strong>on</strong>(type: <em><code>ProviderInterface$Emitted</code></em>, sub: <em><code>ProviderInterface$EmitCb</code></em>): <code>void</code></p>
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<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/b09cbf6/packages/rpc-provider/src/http/index.ts#L64" target="_blank">http/index.ts:64</a></em></p>
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<p><em><strong>summary</strong></em>: Events are not supported with the HttpProvider, see <a href="_ws_index_.wsprovider.html">WsProvider</a>.</p>
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<p><em><strong>description</strong></em>: HTTP Provider does not have 'on' emitters. WebSockets should be used instead.</p>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr>
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<th>Param</th>
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<th>Type</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>type</td>
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<td><code>ProviderInterface$Emitted</code></td>
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</tr>
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<tr>
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<td>sub</td>
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<td><code>ProviderInterface$EmitCb</code></td>
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</tr>
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</tbody>
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</table>
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<p><strong>Returns:</strong> <code>void</code></p>
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<hr>
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<p><a id="send"></a></p>
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<h2 id="send">send</h2>
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<p>▸ <strong>send</strong>(method: <em><code>string</code></em>, params: <em><code>Array</code><<code>any</code>></em>): <code>Promise</code><<code>any</code>></p>
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<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/b09cbf6/packages/rpc-provider/src/http/index.ts#L71" target="_blank">http/index.ts:71</a></em></p>
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<p><em><strong>summary</strong></em>: Send HTTP POST Request with Body to configured HTTP Endpoint.</p>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr>
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<th>Param</th>
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<th>Type</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>method</td>
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<td><code>string</code></td>
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</tr>
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<tr>
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<td>params</td>
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<td><code>Array</code><<code>any</code>></td>
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</tr>
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</tbody>
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</table>
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<p><strong>Returns:</strong> <code>Promise</code><<code>any</code>></p>
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<hr>
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<p><a id="subscribe"></a></p>
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<h2 id="subscribe">subscribe</h2>
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<p>▸ <strong>subscribe</strong>(types: <em><code>string</code></em>, method: <em><code>string</code></em>, params: <em><code>Array</code><<code>any</code>></em>, cb: <em><code>ProviderInterface$Callback</code></em>): <code>Promise</code><<code>number</code>></p>
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<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/b09cbf6/packages/rpc-provider/src/http/index.ts#L93" target="_blank">http/index.ts:93</a></em></p>
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<p><em><strong>summary</strong></em>: Subscriptions are not supported with the HttpProvider, see <a href="_ws_index_.wsprovider.html">WsProvider</a>.</p>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr>
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<th>Param</th>
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<th>Type</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>types</td>
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<td><code>string</code></td>
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</tr>
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<tr>
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<td>method</td>
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<td><code>string</code></td>
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</tr>
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<tr>
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<td>params</td>
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<td><code>Array</code><<code>any</code>></td>
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</tr>
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<tr>
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<td>cb</td>
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<td><code>ProviderInterface$Callback</code></td>
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</tr>
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</tbody>
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</table>
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<p><strong>Returns:</strong> <code>Promise</code><<code>number</code>></p>
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<hr>
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<p><a id="unsubscribe"></a></p>
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<h2 id="unsubscribe">unsubscribe</h2>
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<p>▸ <strong>unsubscribe</strong>(type: <em><code>string</code></em>, method: <em><code>string</code></em>, id: <em><code>number</code></em>): <code>Promise</code><<code>boolean</code>></p>
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<p><em>Defined in <a href="https://github.com/polkadot-js/api/blob/b09cbf6/packages/rpc-provider/src/http/index.ts#L102" target="_blank">http/index.ts:102</a></em></p>
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<p><em><strong>summary</strong></em>: Subscriptions are not supported with the HttpProvider, see <a href="_ws_index_.wsprovider.html">WsProvider</a>.</p>
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<p><strong>Parameters:</strong></p>
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<table>
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<thead>
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<tr>
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<th>Param</th>
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<th>Type</th>
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</tr>
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</thead>
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<tbody>
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<tr>
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<td>type</td>
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<td><code>string</code></td>
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</tr>
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<tr>
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<td>method</td>
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<td><code>string</code></td>
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</tr>
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<td>id</td>
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