httprepo: long arguments support (issue2126) Send the command arguments in the HTTP headers. The command is still part of the URL. If the server does not have the 'httpheader' capability, the client will send the command arguments in the URL as it did previously. Web servers typically allow more data to be placed within the headers than in the URL, so this approach will: - Avoid HTTP errors due to using a URL that is too large. - Allow Mercurial to implement a more efficient wire protocol. An alternate approach is to send the arguments as part of the request body. This approach has been rejected because it requires the use of POST requests, so it would break any existing configuration that relies on the request type for authentication or caching. Extensibility: - The header size is provided by the server, which makes it possible to introduce an hgrc setting for it. - The client ignores the capability value after the first comma, which allows more information to be included in the future.

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Test wire protocol unbundle with hashed heads (capability: unbundlehash)

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Create a remote repository.

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  $ hg init remote

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  $ hg serve -R remote --config web.push_ssl=False --config web.allow_push=* -p $HGPORT -d --pid-file=hg1.pid -E error.log -A access.log

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  $ cat hg1.pid >> $DAEMON_PIDS

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Clone the repository and push a change.

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  $ hg clone http://localhost:$HGPORT/ local

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  no changes found

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  updating to branch default

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  0 files updated, 0 files merged, 0 files removed, 0 files unresolved

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  $ touch local/README

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  $ hg ci -R local -A -m hoge

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  adding README

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  $ hg push -R local

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  pushing to http://localhost:$HGPORT/

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  searching for changes

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  remote: adding changesets

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  remote: adding manifests

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  remote: adding file changes

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  remote: added 1 changesets with 1 changes to 1 files

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Ensure hashed heads format is used.

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The hash here is always the same since the remote repository only has the null head.

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  $ cat access.log | grep unbundle

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  * - - [*] "POST /?cmd=unbundle HTTP/1.1" 200 - x-arg-1:heads=686173686564+6768033e216468247bd031a0a2d9876d79818f8f (glob)