[tor-bugs] #18080 [Tor Browser]: Do not strip the Access-Control-Allow-Origin header

["Tor Bug Tracker & Wiki" <blackhole@xxxxxxxxxxxxxx>]

#18080: Do not strip the Access-Control-Allow-Origin header
-----------------------------+----------------------
     Reporter:  cypherpunks  |      Owner:  tbb-team
         Type:  defect       |     Status:  new
     Priority:  Medium       |  Milestone:
    Component:  Tor Browser  |    Version:
     Severity:  Normal       |   Keywords:
Actual Points:               |  Parent ID:
       Points:               |    Sponsor:
-----------------------------+----------------------
 It seems Tor Browser sometimes strips the Access-Control-Allow-Origin
 header. I ran into the issue when using Globe. When the header is stripped
 the browser console contains the warning
 {{{
 Cross-Origin Request Blocked: The Same Origin Policy disallows reading the
 remote resource at
 https://onionoo.torproject.org/details?lookup=299F0933E93B6571ED1CB3D52090E6E13D62427C.
 (Reason: CORS header 'Access-Control-Allow-Origin' missing).
 }}}

 The reasons why i believe Tor Browser is the cause are
 1. Onionoo explicitly sets the
 [https://gitweb.torproject.org/onionoo.git/tree/src/main/java/org/torproject/onionoo/server/ResourceServlet.java#n343
 header].
 2. Responses from direct requests to an
 [https://onionoo.torproject.org/summary?limit=4 Onionoo resource] using
 Tor Browser sometimes do not show the header in the Network Monitor.
 3. Responses from direct requests to the same Onionoo resource using curl
 consistently contain the header.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/18080>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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