This patch reorganizes the SLO read response handling. The main goal
was to push the response header replacement for both GET/HEAD SLO and
multipart-manifest=get paths all into a common return path. A new
RespAttrs primitive is used to carry around some metadata details from
requests made in SLO. The authors hope these changes make the code more
easily readable and easier to modify.
Drive-By: add new "friendly_close" function in common.utils so we can
drain empty/error responses more confidently (and use it in swob and
request_helpers).
Drive-By: the tests added in the Related-Change discovered a 500 on
If-[Un]Modified-Since conditional GET requests - it probably wasn't
important, but this refactor fixed it on accident as a side effect.
Closes-Bug: #2040178
Co-Authored-By: Alistair Coles <alistairncoles@gmail.com>
Co-Authored-By: Ashwin Nair <nairashwin952013@gmail.com>
Related-Change-Id: I54094f3d2098f56b755ec19cc9315d06a6ca8b15
Change-Id: Idc84e70539fc7480b6ecb86e2f0da904baf2c727
4a37a2976b