serve: send response headers even if response has no body The headers would usually be sent anyway because the app did a number of writes of empty strings.

hgweb: simplify wsgirequest header handling Remove leaky header abstraction and prepare for other encodings.

hgweb: make type a mandatory parameter to request.respond There will thus always be headers and the runtime check can be removed.

hgweb: use Content-Length for pushres This prevents some unnecessary http connection close.

hgweb: send Content-Length 0 for zero length response Before, Content-Length wasn't sent for 0 length responses. Now it is. This could in principle prevent some unnecessary http connection close.

archival: tarit should never close the dest passed to it Some archive types closed the open file passed to it, some didn't. This could cause either missing or duplicate close and cause problems in hgweb. The fix in 14f3795a5ed7 should only have closed the compressors and archivers - not the underlying file itself if no compressor is used.

mq: checktoppatch should only check if p1 is qtip There is no way qtip in p2 could be used for anything, and there is thus no reason to check and accept it.

mq: fix qpop of working directory parent patch when not at qtip mq assumed that it had to update from qtip to qparent, and instead of updating from where it was it failed with: abort: working directory revision is not qtip