This is still happening, a few recent occurrences:
https://source.cloud.google.com/results/invocations/61c24fe5-3f64-4f9c-b295-4a6ecaf146ba
https://source.cloud.google.com/results/invocations/0dda749c-888d-4eb6-afc2-7edaff6927d5
https://source.cloud.google.com/results/invocations/bef71cc2-b582-44c1-87db-d5e4d3a6a938

A more careful look at the logs reveals two things:
It returns response == 0 because the request has timed out (timeout set to 15secs in the test)

I0421 23:18:05.258969568   14514 httpcli_test.cc:68]         test_get
I0421 23:18:05.259000679   14514 httpcli_test.cc:71]         requesting from localhost:30213
... 15sec wait here....
I0421 23:19:20.259763060   14517 httpcli_test.cc:50]         response status 0
E0421 23:19:20.259784984   14517 httpcli_test.cc:51]         assertion failed: response->status == 200

The server has definitely already started, as we've seen cases where the GET request succeeds and a subsequent POST to the same server fails:

I0506 09:38:12.160643462   14602 httpcli_test.cc:68]         test_get
I0506 09:38:12.160684216   14602 httpcli_test.cc:71]         requesting from localhost:14568
127.0.0.1 - - [06/May/2018 09:38:12] "GET /get HTTP/1.0" 200 -
I0506 09:38:12.161980400   14602 httpcli_test.cc:50]         response status 200
I0506 09:38:12.162001820   14602 httpcli_test.cc:107]        test_post
I0506 09:38:12.162006204   14602 httpcli_test.cc:110]        posting to localhost:14568
I0506 09:39:27.162667024   14606 httpcli_test.cc:50]         response status 0
E0506 09:39:27.162693533   14606 httpcli_test.cc:51]         assertion failed: response->status == 200

So it looks like this just needs more debugging.
@yashykt what have we done to rootcause this? This flake has been open for several months and it keeps coming up.

New Failure: httpscli_test (and httpcli_test) #13650

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