Environment

• phabricator 9f3cde4db7654499c1ed565fbf048b8e8710f70a (Sat, Feb 18)
• arcanist 3b6b523c2b236e3724a1e115f126cb6fd05fa128 (Sat, Feb 18)
• phutil ef580c9ccc219b9871588921f545a7609d2b01dc (Sun, Feb 19)
• System:
  • Centos7
  • Apache: httpd-2.4.6-40.el7.centos.4.x86_64
  • DB: mariadb-server-5.5.50-1.el7_2.x86_64
  • PHP:
    • php-pear-1.9.4-21.el7.noarch
    • php-devel-5.4.16-36.3.el7_2.x86_64
    • php-mbstring-5.4.16-36.3.el7_2.x86_64
    • php-common-5.4.16-36.3.el7_2.x86_64
    • php-pdo-5.4.16-36.3.el7_2.x86_64
    • php-5.4.16-36.3.el7_2.x86_64
    • php-process-5.4.16-36.3.el7_2.x86_64
    • php-ldap-5.4.16-36.3.el7_2.x86_64
    • php-cli-5.4.16-36.3.el7_2.x86_64
    • php-mysql-5.4.16-36.3.el7_2.x86_64
    • php-gd-5.4.16-36.3.el7_2.x86_64
    • php-xml-5.4.16-36.3.el7_2.x86_64

Description

We often add *.os files into maniphest tasks. These files comes from an internal document managment system. Apache is configured to handle these files as attachments:

<LocationMatch "\.(?i:os)$">
    ForceType application/octet-stream
    Header set Content-Disposition attachment
</LocationMatch>

These settings worked for about 2 years now.

But now I noticed some weird behavior while downloading files with '*.os' extension. While downloading files with this extension via chrome the extension changes to *.txt

I've already tested it with a bank new system + apache 2.4 and these setting. It works. So it seems to be a problem with phabricator and how it delivers the files.

Reproduction Steps

• Browse to a maniphest tasks containing a *.os file.

• Download the file using the Link it fails:

• Downloading the file in the files app it works:

• OS File for testing: