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

[Tor Bug Tracker & Wiki]

#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 Browser        |        Version:
 Severity:  Normal                          |     Resolution:
 Keywords:  tbb-regression, tbb-8.0-issues  |  Actual Points:
Parent ID:                                  |         Points:
 Reviewer:                                  |        Sponsor:
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Comment (by cypherpunks):

 gk told me to come here from the blog:
 https://blog.torproject.org/comment/279574#comment-279574

 Linux x64
 Tor Browser 8 to now (8.0.5)
 TorButton "Safest"
 DuckDuckGoOnion

 I started to notice it in September 2018 around TBB 8, and it goes on to
 the present day.  I use DuckDuckGoOnion from the URL bar or the broswer's
 UI search bar.  The error "400 Bad Request nginx" usually appears on the
 first search after starting Tor Browser or a New Identity. When I click a
 second time, it always goes through ok from that point forward until 1) I
 reopen Tor Browser or make a New Identity or 2) less often in the same
 session when I haven't searched in a long time (30-90 minutes I think).
 While on "Safer," I think the error doesn't appear as often.

 I can't speak for Startpage because I do not use it.

 I don't know if the following relates, but I received it after successful
 searches on "Safest" on https://duckduckgo.com/html/ (not the onion) in
 the webpage UI's search box, not by searching from the URL bar or
 browser's UI search bar.  The page was empty, white, and black text said:
     We've detected that you have connected over Tor. There appears to be
 an issue with the Tor Exit Node you are currently using. Please recreate
 your Tor circuit or restart your Tor browser in order to fix this. If this
 error persists, please let us know: error-lite-tor @ duckduckgo.com

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/29119#comment:2>
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