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Kudu supports the Git Smart protocol. In summary we handle 4 requests:

Smart Protocol

Push

A push is made up of 2 or more requests, it's a GET followed by a 1 of more POSTs. If the first request fails for any reason, then git will try to use the DUMB PROTOCOL (More info below).

GET myapp.git/info/refs?service=receive-pack

This request creates the repository if there's none there and if tells git what the server has (so it can do incremental updates).

POST myapp.git/receive-pack  

This request sends the payload (there's may be multiple of these).

Clone is pretty much the same.

Clone

GET myapp.git/info/refs?service=upload-pack

POST myapp.git/upload-pack  

This returns the response.

See for more details about the protocol http://progit.org/2010/03/04/smart-http.html.

DUMB Protocol

We don't support this and will return a 501 Not Implemented status code if git tries to use this we will fail.

A 501 (Not Implemented) from Kudu generally means that a prior request failed for some reason. In previous cases where we have seen this, the initial request from the git client failed with some error (e.g. a 503), causing the git client to fall back to an unsupported protocol (hence the 501). So the 501 is not the real error, but only a side effect of the real error.

Something went wrong with that request. Please try again.