[pve-devel] http protocol question

Dietmar Maurer dietmar at proxmox.com
Thu Jun 6 19:27:29 CEST 2013


Hi all,

I am just hunting a very strange bug. I observe that pveproxy sometimes receives the same POST request twice
when it closes the connection due to a timeout.

The HTTP Specs contains the following section: http://www.w3.org/Protocols/rfc2616/rfc2616-sec8.html
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8.2.4 Client Behavior if Server Prematurely Closes Connection
If an HTTP/1.1 client sends a request which includes a request body, but which does not include an Expect request-header field with the "100-continue" expectation, and if the client is not directly connected to an HTTP/1.1 origin server, and if the client sees the connection close before receiving any status from the server, the client SHOULD retry the request. If the client does retry this request, it MAY use the following "binary exponential backoff" algorithm to be assured of obtaining a reliable response:
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Does that really mean that the client is allowed to send the POST request twice?





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