http/request: reset body mbuf pos on re-sending #1116
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This fixes the following bug:
If a HTTP request is resent (e.g. with Authentication after a 401 response), the body of the request is not sent.
This is because in
req_body_handlermbuf_advance(conn->body, len)is called. Then the request is re-sent and the body size is obtained by callingmbuf_get_left(conn->body)which is now incorrect.The fix is to reset the
mbufposition ofconn->bodybefore re-sending a request.