[Bug 1788435] [NEW] Backport Workaround for Content-Encoding: None

[canavan]

Public bug reported:

With the upgrade to curl 7.58.0 in Ubuntu 18.04, the behavior of libcurl
has changed when CURLOPT_ACCEPT_ENCODING is set to values other than
NULL, and an unknown encoding is used by the server. Previously, curl
would decode "gzip" and "deflate" (and now "br") and quietly pass any
other, unknown encoding. Now it returns (61) "Unrecognized content
encoding type...".

There's a specific workaround, already released in curl 7.59.0 for the
problem we encountered after upgrading, namely that some servers use
"None" instead of "Identity" to indicate transparent / no encoding:

https://github.com/curl/curl/commit/f886cbfe9c3055999d8174b2eedc826d0d9a54f1

Please backport this patch to Ubuntu 18.04.

Discussion on the libcurl mailing list:
https://curl.haxx.se/mail/lib-2018-08/0192.html

** Affects: curl (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1788435

Title:
  Backport Workaround for Content-Encoding: None

Status in curl package in Ubuntu:
  New

Bug description:
  With the upgrade to curl 7.58.0 in Ubuntu 18.04, the behavior of
  libcurl has changed when CURLOPT_ACCEPT_ENCODING is set to values
  other than NULL, and an unknown encoding is used by the server.
  Previously, curl would decode "gzip" and "deflate" (and now "br") and
  quietly pass any other, unknown encoding. Now it returns (61)
  "Unrecognized content encoding type...".

  There's a specific workaround, already released in curl 7.59.0 for the
  problem we encountered after upgrading, namely that some servers use
  "None" instead of "Identity" to indicate transparent / no encoding:

  https://github.com/curl/curl/commit/f886cbfe9c3055999d8174b2eedc826d0d9a54f1

  Please backport this patch to Ubuntu 18.04.

  Discussion on the libcurl mailing list:
  https://curl.haxx.se/mail/lib-2018-08/0192.html

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