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<div class="dev_page_bread_crumbs"><ul class="breadcrumb clearfix"><li><a href="/api" >API</a></li><i class="icon icon-breadcrumb-divider"></i><li><a href="/api/errors" >Error handling </a></li></ul></div>
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<h1 id="dev_page_title">Error handling </h1>
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<div id="dev_page_content"><p>There will be errors when working with the API, and they must be correctly handled on the client.<br>
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An error is characterized by several parameters:</p>
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<h4><a class="anchor" href="#error-code" id="error-code" name="error-code"><i class="anchor-icon"></i></a>Error Code</h4>
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<p>Numerical value similar to HTTP status. Contains information on the type of error that occurred: for example, a data input error, privacy error, or server error. This is a required parameter.</p>
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<h4><a class="anchor" href="#error-type" id="error-type" name="error-type"><i class="anchor-icon"></i></a>Error Type</h4>
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<p>A string literal in the form of <code>/[A-Z_0-9]+/</code>, which summarizes the problem. For example, <code>AUTH_KEY_UNREGISTERED</code>. This is an optional parameter.</p>
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<h4><a class="anchor" href="#error-database" id="error-database" name="error-database"><i class="anchor-icon"></i></a>Error Database</h4>
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<p>A full machine-readable JSON list of RPC errors that can be returned by all methods in the API can be found <a href="/file/464001173/109f8/k9gTkjfzNHs.87735.json/de2c1dc08a54bde597">here »</a>, what follows is a description of its fields: </p>
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<ul>
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<li><code>errors</code> - All error messages and codes for each method (object).<ul>
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<li>Keys: Error codes as strings (numeric strings)</li>
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<li>Values: All error messages for each method (object)<ul>
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<li>Keys: Error messages (string)</li>
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<li>Values: An array of methods which may emit this error (array of strings)</li>
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</ul>
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</li>
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</ul>
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</li>
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<li><code>descriptions</code> - Descriptions for every error mentioned in <code>errors</code> (and a few other errors not related to a specific method)<ul>
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<li>Keys: Error messages</li>
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<li>Values: Error descriptions</li>
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</ul>
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</li>
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<li><code>user_only</code> - A list of methods that can only be used by users, <strong>not</strong> bots.</li>
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</ul>
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<p>Error messages and error descriptions may contain <code>printf</code> placeholders in key positions, for now only <code>%d</code> is used to map durations contained in error messages to error descriptions.</p>
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<p>Example:</p>
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<pre><code class="language-json">{
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"errors": {
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"420": {
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"2FA_CONFIRM_WAIT_%d": [
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"account.deleteAccount"
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],
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"SLOWMODE_WAIT_%d": [
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"messages.forwardMessages",
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"messages.sendInlineBotResult",
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"messages.sendMedia",
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"messages.sendMessage",
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"messages.sendMultiMedia"
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]
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}
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},
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"descriptions": {
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"2FA_CONFIRM_WAIT_%d": "Since this account is active and protected by a 2FA password, we will delete it in 1 week for security purposes. You can cancel this process at any time, you'll be able to reset your account in %d seconds.",
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"SLOWMODE_WAIT_%d": "Slowmode is enabled in this chat: wait %d seconds before sending another message to this chat.",
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"FLOOD_WAIT_%d": "Please wait %d seconds before repeating the action."
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},
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"user_only": {
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"account.deleteAccount"
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}
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}</code></pre>
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<hr>
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<h4><a class="anchor" href="#error-constructors" id="error-constructors" name="error-constructors"><i class="anchor-icon"></i></a>Error Constructors</h4>
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<p>There should be a way to handle errors that are returned in <a href="/mtproto/service_messages#rpc-error">rpc_error</a> constructors.</p>
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<p>Below is a list of error codes and their meanings:</p>
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<h3><a class="anchor" href="#303-see-other" id="303-see-other" name="303-see-other"><i class="anchor-icon"></i></a>303 SEE_OTHER</h3>
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<p>The request must be repeated, but directed to a different data center.</p>
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<h4><a class="anchor" href="#examples-of-errors" id="examples-of-errors" name="examples-of-errors"><i class="anchor-icon"></i></a>Examples of Errors:</h4>
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<ul>
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<li>FILE_MIGRATE_X: the file to be accessed is currently stored in a different data center.</li>
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<li>PHONE_MIGRATE_X: the phone number a user is trying to use for authorization is associated with a different data center.</li>
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<li>NETWORK_MIGRATE_X: the source IP address is associated with a different data center (for registration)</li>
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<li>USER_MIGRATE_X: the user whose identity is being used to execute queries is associated with a different data center (for registration)</li>
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</ul>
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<p>In all these cases, the error description's string literal contains the number of the data center (instead of the X) to which the repeated query must be sent.
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<a href="/api/datacenter">More information about redirects between data centers »</a></p>
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<h3><a class="anchor" href="#400-bad-request" id="400-bad-request" name="400-bad-request"><i class="anchor-icon"></i></a>400 BAD_REQUEST</h3>
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<p>The query contains errors. In the event that a request was created using a form and contains user generated data, the user should be notified that the data must be corrected before the query is repeated.</p>
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<h4><a class="anchor" href="#examples-of-errors" id="examples-of-errors" name="examples-of-errors"><i class="anchor-icon"></i></a>Examples of Errors:</h4>
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<ul>
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<li>FIRSTNAME_INVALID: The first name is invalid</li>
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<li>LASTNAME_INVALID: The last name is invalid</li>
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<li>PHONE_NUMBER_INVALID: The phone number is invalid</li>
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<li>PHONE_CODE_HASH_EMPTY: phone_code_hash is missing</li>
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<li>PHONE_CODE_EMPTY: phone_code is missing</li>
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<li>PHONE_CODE_EXPIRED: The confirmation code has expired</li>
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<li>API_ID_INVALID: The api_id/api_hash combination is invalid</li>
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<li>PHONE_NUMBER_OCCUPIED: The phone number is already in use</li>
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<li>PHONE_NUMBER_UNOCCUPIED: The phone number is not yet being used</li>
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<li>USERS_TOO_FEW: Not enough users (to create a chat, for example)</li>
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<li>USERS_TOO_MUCH: The maximum number of users has been exceeded (to create a chat, for example)</li>
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<li>TYPE_CONSTRUCTOR_INVALID: The type constructor is invalid</li>
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<li>FILE_PART_INVALID: The file part number is invalid</li>
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<li>FILE_PARTS_INVALID: The number of file parts is invalid</li>
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<li>FILE_PART_X_MISSING: Part X (where X is a number) of the file is missing from storage</li>
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<li>MD5_CHECKSUM_INVALID: The MD5 checksums do not match</li>
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<li>PHOTO_INVALID_DIMENSIONS: The photo dimensions are invalid</li>
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<li>FIELD_NAME_INVALID: The field with the name FIELD_NAME is invalid</li>
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<li>FIELD_NAME_EMPTY: The field with the name FIELD_NAME is missing</li>
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<li>MSG_WAIT_FAILED: A request that must be completed before processing the current request returned an error</li>
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<li>MSG_WAIT_TIMEOUT: A request that must be completed before processing the current request didn't finish processing yet</li>
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</ul>
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<h3><a class="anchor" href="#401-unauthorized" id="401-unauthorized" name="401-unauthorized"><i class="anchor-icon"></i></a>401 UNAUTHORIZED</h3>
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<p>There was an unauthorized attempt to use functionality available only to authorized users.</p>
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<h4><a class="anchor" href="#examples-of-errors" id="examples-of-errors" name="examples-of-errors"><i class="anchor-icon"></i></a>Examples of Errors:</h4>
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<ul>
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<li>AUTH_KEY_UNREGISTERED: The key is not registered in the system</li>
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<li>AUTH_KEY_INVALID: The key is invalid</li>
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<li>USER_DEACTIVATED: The user has been deleted/deactivated</li>
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<li>SESSION_REVOKED: The authorization has been invalidated, because of the user terminating all sessions</li>
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<li>SESSION_EXPIRED: The authorization has expired</li>
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<li>AUTH_KEY_PERM_EMPTY: The method is unavailable for temporary authorization key, not bound to permanent</li>
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</ul>
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<h3><a class="anchor" href="#403-forbidden" id="403-forbidden" name="403-forbidden"><i class="anchor-icon"></i></a>403 FORBIDDEN</h3>
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<p>Privacy violation. For example, an attempt to write a message to someone who has blacklisted the current user.</p>
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<h3><a class="anchor" href="#404-not-found" id="404-not-found" name="404-not-found"><i class="anchor-icon"></i></a>404 NOT_FOUND</h3>
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<p>An attempt to invoke a non-existent object, such as a method.</p>
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<h3><a class="anchor" href="#406-not-acceptable" id="406-not-acceptable" name="406-not-acceptable"><i class="anchor-icon"></i></a>406 NOT_ACCEPTABLE</h3>
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<p>Similar to <a href="#400-bad-request">400 BAD_REQUEST</a>, but the app must display the error to the user a bit differently.<br>
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Do not display any visible error to the user when receiving the <code>rpc_error</code> constructor: instead, wait for an <a href="/constructor/updateServiceNotification">updateServiceNotification</a> update, and handle it as usual.<br>
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Basically, an <a href="/constructor/updateServiceNotification">updateServiceNotification</a> <code>popup</code> update will be emitted independently (ie NOT as an <a href="/type/Updates">Updates</a> constructor inside <code>rpc_result</code> but as a normal update) immediately after emission of a 406 <code>rpc_error</code>: the update will contain the actual localized error message to show to the user with a UI popup. </p>
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<p>An exception to this is the <code>AUTH_KEY_DUPLICATED</code> error, which is only emitted if any of the non-media DC detects that an authorized session is sending requests in parallel from two separate TCP connections, from the same or different IP addresses.<br>
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Note that parallel connections are still allowed and actually recommended for media DCs.<br>
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Also note that by session we mean a logged-in session identified by an <a href="/constructor/authorization">authorization</a> constructor, fetchable using <a href="/method/account.getAuthorizations">account.getAuthorizations</a>, not an MTProto session. </p>
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<p>If the client receives an <code>AUTH_KEY_DUPLICATED</code> error, the session is already invalidated by the server and the user must generate a new auth key and login again. </p>
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<h3><a class="anchor" href="#420-flood" id="420-flood" name="420-flood"><i class="anchor-icon"></i></a>420 FLOOD</h3>
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<p>The maximum allowed number of attempts to invoke the given method with the given input parameters has been exceeded. For example, in an attempt to request a large number of text messages (SMS) for the same phone number.</p>
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<h4><a class="anchor" href="#error-example" id="error-example" name="error-example"><i class="anchor-icon"></i></a>Error Example:</h4>
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<ul>
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<li>FLOOD_WAIT_X: A wait of X seconds is required (where X is a number)</li>
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</ul>
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<h3><a class="anchor" href="#500-internal" id="500-internal" name="500-internal"><i class="anchor-icon"></i></a>500 INTERNAL</h3>
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<p>An internal server error occurred while a request was being processed; for example, there was a disruption while accessing a database or file storage.</p>
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<p>If a client receives a 500 error, or you believe this error should not have occurred, please collect as much information as possible about the query and error and send it to the developers.</p>
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<h3><a class="anchor" href="#other-error-codes" id="other-error-codes" name="other-error-codes"><i class="anchor-icon"></i></a>Other Error Codes</h3>
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<p>If a server returns an error with a code other than the ones listed above, it may be considered the same as a 500 error and treated as an <a href="#500-internal">internal server error</a>.</p></div>
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