[tbb-bugs] #29119 [Applications/Tor Browser]: Searching after start-up when about:tor is loaded returns "400 Bad Request" sometimes

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#29119: Searching after start-up when about:tor is loaded returns "400 Bad Request"
sometimes
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     Reporter:  gk                   |      Owner:  tbb-team
         Type:  defect               |     Status:  new
     Priority:  Medium               |  Milestone:
    Component:  Applications/Tor     |    Version:
  Browser                            |   Keywords:  tbb-regression,
     Severity:  Normal               |  tbb-8.0-issues
Actual Points:                       |  Parent ID:
       Points:                       |   Reviewer:
      Sponsor:                       |
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 Some users noted that when doing a search right after start-up it happens
 sometimes that e.g. Startpage (and I think DuckDuckGo as well) return a
 "400 Bad Request".

 I've been hitting this issue as well and I can reproduce it if I try hard
 enough (I need less than 10 attempts).

 I think that behavior started with Tor Browser 8, thus setting the
 respective flags.

 Comparing Tor Browser logs do not show anything unusual, though, weird.

 That's on Linux. Not sure whether other platforms are affected.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29119>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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