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channels.mark

This method moves the read cursor in a channel.

Arguments

This method has the URL https://slack.com/api/channels.mark and follows the Slack Web API calling conventions.

Argument Example Required Description
token xxxx-xxxxxxxxx-xxxx Required

Authentication token.
Requires scope: channels:write

channel C1234567890 Required

Channel to set reading cursor in.

ts 1234567890.123456 Required

Timestamp of the most recently seen message.

Response

{
    "ok": true
}

After making this call, the mark is saved to the database and broadcast via the message server to all open connections for the calling user.

Clients should try to avoid making this call too often. When needing to mark a read position, a client should set a timer before making the call. In this way, any further updates needed during the timeout will not generate extra calls (just one per channel). This is useful for when reading scroll-back history, or following a busy live channel. A timeout of 5 seconds is a good starting point. Be sure to flush these calls on shutdown/logout.

Errors

This table lists the expected errors that this method could return. However, other errors can be returned in the case where the service is down or other unexpected factors affect processing. Callers should always check the value of the ok params in the response.

Error Description
channel_not_found

Value passed for channel was invalid.

invalid_timestamp

Value passed for timestamp was invalid.

not_in_channel

Caller is not a member of the channel.

not_authed

No authentication token provided.

invalid_auth

Invalid authentication token.

account_inactive

Authentication token is for a deleted user or team.

invalid_arg_name

The method was passed an argument whose name falls outside the bounds of common decency. This includes very long names and names with non-alphanumeric characters other than _. If you get this error, it is typically an indication that you have made a very malformed API call.

invalid_array_arg

The method was passed a PHP-style array argument (e.g. with a name like foo[7]). These are never valid with the Slack API.

invalid_charset

The method was called via a POST request, but the charset specified in the Content-Type header was invalid. Valid charset names are: utf-8 iso-8859-1.

invalid_form_data

The method was called via a POST request with Content-Type application/x-www-form-urlencoded or multipart/form-data, but the form data was either missing or syntactically invalid.

invalid_post_type

The method was called via a POST request, but the specified Content-Type was invalid. Valid types are: application/x-www-form-urlencoded multipart/form-data text/plain.

missing_post_type

The method was called via a POST request and included a data payload, but the request did not include a Content-Type header.

request_timeout

The method was called via a POST request, but the POST data was either missing or truncated.

Warnings

This table lists the expected warnings that this method will return. However, other warnings can be returned in the case where the service is experiencing unexpected trouble.

Warning Description
missing_charset

The method was called via a POST request, and recommended practice for the specified Content-Type is to include a charset parameter. However, no charset was present. Specifically, non-form-data content types (e.g. text/plain) are the ones for which charset is recommended.

superfluous_charset

The method was called via a POST request, and the specified Content-Type is not defined to understand the charset parameter. However, charset was in fact present. Specifically, form-data content types (e.g. multipart/form-data) are the ones for which charset is superfluous.