url: support suppressing Accept header
Sending this header automatically could interfere with future
testing and client behavior. Let's add a knob to disable the
behavior.
We don't have a control for User-Agent because urllib will send
it if we don't set something. I don't feel like hacking into the
bowels of urllib to figure out how to suppress that. UA shouldn't
be used for anything meaningful. So it shouldn't pose any problems
beyond non-determinism (since the header has the Mercurial version in
it).
Differential Revision: https://phab.mercurial-scm.org/D2843
$ cat >> $HGRCPATH << EOF
> [web]
> push_ssl = false
> allow_push = *
> EOF
$ hg init server
$ cd server
$ touch a
$ hg -q commit -A -m initial
$ cd ..
$ hg serve -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid >> $DAEMON_PIDS
compression formats are advertised in compression capability
#if zstd
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=capabilities' | tr ' ' '\n' | grep '^compression=zstd,zlib$' > /dev/null
#else
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=capabilities' | tr ' ' '\n' | grep '^compression=zlib$' > /dev/null
#endif
$ killdaemons.py
server.compressionengines can replace engines list wholesale
$ hg serve --config server.compressionengines=none -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=capabilities' | tr ' ' '\n' | grep '^compression=none$' > /dev/null
$ killdaemons.py
Order of engines can also change
$ hg serve --config server.compressionengines=none,zlib -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=capabilities' | tr ' ' '\n' | grep '^compression=none,zlib$' > /dev/null
$ killdaemons.py
Start a default server again
$ hg serve -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
Server should send application/mercurial-0.1 to clients if no Accept is used
$ get-with-headers.py --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.1
date: $HTTP_DATE$
server: testing stub value
transfer-encoding: chunked
Server should send application/mercurial-0.1 when client says it wants it
$ get-with-headers.py --hgproto '0.1' --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.1
date: $HTTP_DATE$
server: testing stub value
transfer-encoding: chunked
Server should send application/mercurial-0.2 when client says it wants it
$ get-with-headers.py --hgproto '0.2' --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.2
date: $HTTP_DATE$
server: testing stub value
transfer-encoding: chunked
$ get-with-headers.py --hgproto '0.1 0.2' --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.2
date: $HTTP_DATE$
server: testing stub value
transfer-encoding: chunked
Requesting a compression format that server doesn't support results will fall back to 0.1
$ get-with-headers.py --hgproto '0.2 comp=aa' --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' -
200 Script output follows
content-type: application/mercurial-0.1
date: $HTTP_DATE$
server: testing stub value
transfer-encoding: chunked
#if zstd
zstd is used if available
$ get-with-headers.py --hgproto '0.2 comp=zstd' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 36 --sha1 resp
resp: size=248, sha1=4d8d8f87fb82bd542ce52881fdc94f850748
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 04 7a 73 74 64 |t follows...zstd|
0020: 28 b5 2f fd |(./.|
#endif
application/mercurial-0.2 is not yet used on non-streaming responses
$ get-with-headers.py --hgproto '0.2' $LOCALIP:$HGPORT '?cmd=heads' -
200 Script output follows
content-length: 41
content-type: application/mercurial-0.1
date: $HTTP_DATE$
server: testing stub value
e93700bd72895c5addab234c56d4024b487a362f
Now test protocol preference usage
$ killdaemons.py
$ hg serve --config server.compressionengines=none,zlib -R server -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
No Accept will send 0.1+zlib, even though "none" is preferred b/c "none" isn't supported on 0.1
$ get-with-headers.py --headeronly $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' Content-Type
200 Script output follows
content-type: application/mercurial-0.1
$ get-with-headers.py $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 28 --sha1 resp
resp: size=227, sha1=35a4c074da74f32f5440da3cbf04
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 78 |t follows..x|
Explicit 0.1 will send zlib because "none" isn't supported on 0.1
$ get-with-headers.py --hgproto '0.1' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 28 --sha1 resp
resp: size=227, sha1=35a4c074da74f32f5440da3cbf04
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 78 |t follows..x|
0.2 with no compression will get "none" because that is server's preference
(spec says ZL and UN are implicitly supported)
$ get-with-headers.py --hgproto '0.2' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 32 --sha1 resp
resp: size=432, sha1=ac931b412ec185a02e0e5bcff98dac83
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 04 6e 6f 6e 65 |t follows...none|
Client receives server preference even if local order doesn't match
$ get-with-headers.py --hgproto '0.2 comp=zlib,none' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 32 --sha1 resp
resp: size=432, sha1=ac931b412ec185a02e0e5bcff98dac83
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 04 6e 6f 6e 65 |t follows...none|
Client receives only supported format even if not server preferred format
$ get-with-headers.py --hgproto '0.2 comp=zlib' $LOCALIP:$HGPORT '?cmd=getbundle&heads=e93700bd72895c5addab234c56d4024b487a362f&common=0000000000000000000000000000000000000000' > resp
$ f --size --hexdump --bytes 33 --sha1 resp
resp: size=232, sha1=a1c727f0c9693ca15742a75c30419bc36
0000: 32 30 30 20 53 63 72 69 70 74 20 6f 75 74 70 75 |200 Script outpu|
0010: 74 20 66 6f 6c 6c 6f 77 73 0a 0a 04 7a 6c 69 62 |t follows...zlib|
0020: 78 |x|
$ killdaemons.py
$ cd ..
Test listkeys for listing namespaces
$ hg init empty
$ hg -R empty serve -p $HGPORT -d --pid-file hg.pid
$ cat hg.pid > $DAEMON_PIDS
$ hg --verbose debugwireproto http://$LOCALIP:$HGPORT << EOF
> command listkeys
> namespace namespaces
> EOF
s> GET /?cmd=capabilities HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> accept: application/mercurial-0.1\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: mercurial/proto-1.0 (Mercurial *)\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 Script output follows\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-0.1\r\n
s> Content-Length: *\r\n (glob)
s> \r\n
s> lookup branchmap pushkey known getbundle unbundlehash batch changegroupsubset streamreqs=generaldelta,revlogv1 $USUAL_BUNDLE2_CAPS_SERVER$ unbundle=HG10GZ,HG10BZ,HG10UN httpheader=1024 httpmediatype=0.1rx,0.1tx,0.2tx compression=$BUNDLE2_COMPRESSIONS$
sending listkeys command
s> GET /?cmd=listkeys HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> vary: X-HgArg-1,X-HgProto-1\r\n
s> x-hgarg-1: namespace=namespaces\r\n
s> x-hgproto-1: 0.1 0.2 comp=$USUAL_COMPRESSIONS$\r\n
s> accept: application/mercurial-0.1\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> user-agent: mercurial/proto-1.0 (Mercurial *)\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 Script output follows\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-0.1\r\n
s> Content-Length: 30\r\n
s> \r\n
s> bookmarks \n
s> namespaces \n
s> phases
response: bookmarks \nnamespaces \nphases
Same thing, but with "httprequest" command
$ hg --verbose debugwireproto --peer raw http://$LOCALIP:$HGPORT << EOF
> httprequest GET ?cmd=listkeys
> user-agent: test
> x-hgarg-1: namespace=namespaces
> EOF
using raw connection to peer
s> GET /?cmd=listkeys HTTP/1.1\r\n
s> Accept-Encoding: identity\r\n
s> user-agent: test\r\n
s> x-hgarg-1: namespace=namespaces\r\n
s> host: $LOCALIP:$HGPORT\r\n (glob)
s> \r\n
s> makefile('rb', None)
s> HTTP/1.1 200 Script output follows\r\n
s> Server: testing stub value\r\n
s> Date: $HTTP_DATE$\r\n
s> Content-Type: application/mercurial-0.1\r\n
s> Content-Length: 30\r\n
s> \r\n
s> bookmarks \n
s> namespaces \n
s> phases
$ killdaemons.py