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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