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Can someone help me understand what "/_ah/background" is in terms of google app engine (Python). I have a resident backend running, and I am seeing requests being made to that endpoint. They appear to be generated by something outside my code. They also appear to be being handled by my /_ah/start handler.

Thanks for any help you can provide.

Miles Porter
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2 Answers2

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I believe /_ah/background requests aren't actually HTTP requests, they're background threads. App Engine uses /_ah/background as a placeholder wherever it needs to group something by request, e.g. log messages. This matches what I see in my backends that use background threads.

(I could swear I read this in the docs somewhere recently, but I haven't found where yet.)

ryan
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Any URL that starts with "/_ah/" is a reserved AppEngine URL. These are used for internal AppEngine tasks, you really shouldn't need to worry about them.

What does _ah mean in Google App Engine?

https://developers.google.com/appengine/docs/python/config/appconfig?hl=it-IT#Reserved_URLs

Community
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Robert Parker
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    To be clear, my question is why is google calling /_ah/background and why is it hitting my start handler. I am not attempting to make calls to these *reserved* handlers, however you can and should worry about them when creating backend instances in app engine. Please see this: https://developers.google.com/appengine/docs/python/backends/#Startup – Miles Porter Jul 05 '13 at 19:43
  • depending on the language/framework you use, this unuseful error gets your logs quite dirty – Ben Mar 20 '16 at 23:47