[Bug 1692870] Re: gzip compression broken in UniFi (built-in tomcat)

[Jean-Louis Dupond]

** Patch added: "New version with patch included."
   https://bugs.launchpad.net/ubuntu/+source/zlib/+bug/1692870/+attachment/4881920/+files/fix_deflateParams.debdiff

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to zlib in Ubuntu.
https://bugs.launchpad.net/bugs/1692870

Title:
  gzip compression broken in UniFi (built-in tomcat)

Status in zlib package in Ubuntu:
  New

Bug description:
  Hi,

  Since I upgraded from Ubuntu 16.10 to 17.04, my Guest portal for my
  UniFi system was broken (https://www.ubnt.com/download/unifi/).

  Curl gave me the following response:
  # curl -vvvv --compress localhost:8880/guest/s/default/
  *   Trying ::1...
  * TCP_NODELAY set
  * Connected to localhost (::1) port 8880 (#0)
  > GET /guest/s/default/ HTTP/1.1
  > Host: localhost:8880
  > User-Agent: curl/7.52.1
  > Accept: */*
  > Accept-Encoding: deflate, gzip
  > 
  < HTTP/1.1 200 OK
  < Server: Apache-Coyote/1.1
  < Content-Type: text/html;charset=utf-8
  < Transfer-Encoding: chunked
  < Content-Encoding: gzip
  < Vary: Accept-Encoding
  < Date: Tue, 23 May 2017 11:19:22 GMT
  < 
  * Error while processing content unencoding: invalid code lengths set
  * Failed writing data
  * Curl_http_done: called premature == 1
  * Closing connection 0
  curl: (23) Error while processing content unencoding: invalid code lengths set

  
  After some debugging, I found out that downgrading to zlib 1:1.2.8.dfsg-2ubuntu5.1 was a workaround.

  Now after digging into the issue some more, I found the following upstream patch (unreleased version), fixes the issue:
  https://github.com/madler/zlib/commit/f9694097dd69354b03cb8af959094c7f260db0a1

  I've created a new package, and its working fine again.

  Now as the UniFi controller is just some Tomcat, which relies on Java
  (OpenJDK), which uses zlib for its built-in Compression/Decompression.
  I guess even more java related tools can be broken. But I didn't have
  time to test this.

  At least some other people using UniFi have the same issue, see:
  https://community.ubnt.com/t5/UniFi-Wireless/ERR-CONTENT-DECODING-FAILED-on-guest-portal-customisation/td-p/1903419

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/zlib/+bug/1692870/+subscriptions