Python 2.7.9+ and 3.2.6+ limits the number of maximum headers in httplib to 100
[1,2,3]. This setting is too low for Swift.
By default the maximum number of allowed headers depends on the number of max
allowed metadata settings plus a default value of 32 for regular http headers.
If for some reason this is not enough (custom middleware for example) it can be
increased with the extra_header_count constraint.
[1] https://bugs.python.org/issue16037
[2] https://hg.python.org/cpython/raw-file/15c95b7d81dc/Misc/NEWS
[3] https://hg.python.org/cpython/raw-file/v3.2.6/Misc/NEWS
Co-Authored-By: Clay Gerrard <clay.gerrard@gmail.com>
Co-Authored-By: Matthew Oliver <matt@oliver.net.au>
Co-Authored-By: Thomas Herve <therve@redhat.com>
Change-Id: I388fd697ec88476024b0e9f1ae75ba35ff765282
edfca861b6