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Today was spent reworking so much of the webdav special remote that it was
essentially rewritten from scratch.
The main improvement is that it now keeps a http connection open and uses
it to perform multiple actions. Before, one connection was made per action.
This is even done for operations on chunks. So, now storing a chunked file
in webdav makes only 2 http connections total. Before, it would take around
10 connections *per chunk*. So a big win for performance, although there is
still room for improvement: It would be possible to reduce that down to
just 1 connection, and indeed keep a persistent connection reused when
acting on multiple files.
Finished up by making uploading a large (non-chunked) file to webdav not
buffer the whole file in memory.
I still need to make downloading a file from webdav not buffer it, and
test, and then I'll be done with webdav and can move on to making
similar changes to S3.
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