eco, basic, and standard-1x have 512 MB.Requests containing a request line or header line longer than 8KB will be dropped by the router without being dispatched.ĭifferent dyno sizes offer different amounts of maximum RAM: Each of these can be at most 8 KB in length, but together can be more than 8 KB in total. When processing an incoming request, a router sets up an 8 KB receive buffer and begins reading the HTTP request line and request headers. The router maintains a 1MB buffer for responses from the dyno per connection. Similarly, if no data is received from the client within the 55 second window, the connection is terminated and an H28 error is logged. If no data is received from the dyno within the 55 second window the connection is terminated and an H15 error is logged. A similar 55 second window is restarted for every byte sent from the client. Processes that do not send response data within the initial 30-second window will see an H12 error in their logs.Īfter the initial response, each byte sent from the server restarts a rolling 55 second window. HTTP requests have an initial 30 second window in which the web process must return response data (either the completed response or some amount of response data to indicate that the process is active). Any output reaching that limit will be truncated from its beginning in chunks of 150 MB. Log output generated by builds, CI runs and release phase are limited to 300 MB. Each chunk is submitted as a separate log line. Lines generated by dynos that exceed 10000 bytes are split into 10000 byte chunks without extra trailing newlines. You can have up to 5 drains on any given app. If you’d like to persist more than 1500 lines, use a logging add-on or create your own syslog drain.
Heroku only stores the last 1500 lines of log history. Maximum custom domains per appĪ single app can have up to 1,000 custom domains assigned to it. Maximum number of appsĪn account can have no more than 100 apps. Apps App namesĪpp names cannot exceed 30 characters. Many of the limits listed below link to another Dev Center article that provides additional context regarding the limit. Others exist to ensure good platform citizenship (for example, you can’t make more than 4500 Platform API requests per hour).
Some exist because of the architecture of the Heroku platform (for example, Heroku stores only the most recent 1500 lines of an app’s log history). This article is an aggregation of the limits imposed on various components of the Heroku platform.
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