Joost den Boer created HTTPCLIENT-1616:
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Summary: Request 'hangs' on invalid response from server
Key: HTTPCLIENT-1616
URL: https://issues.apache.org/jira/browse/HTTPCLIENT-1616
Project: HttpComponents HttpClient
Issue Type: Bug
Components: Fluent HC, HttpClient
Affects Versions: 4.3.6
Environment: Java 8
Running test with either Maven or IntelliJ.
Reporter: Joost den Boer
When using the fluent api to do a request and the response of the previous
request was status NoContent, but (!) the server did send some content anyway,
then the next request is blocked for a long time. No response is ever returned.
Eventually some timeout will unblock the thread, but the request has failed.
To reproduce this issue:
- create a server which returns a NoContent with some text body.
- do a first request
- do a second request. This request hangs/blocks the thread for long time.
We're using Fluent API to easily unit test our rest api. In a test class where
a test was doing multiple requests, the first test would pass, but the second
test would stall and eventually fail. Individually the tests were passing. I
could not find any issue on the server side, so I tried another http client
(Ning) which seemed to fix the issue. After rewriting the test to use Ning
instead of HttpClient, the tests were successful, but when I changed it to
reuse the same AsyncHttpClient, I got the same issue. However, because Ning
does not block but throws an exception, I was finally able to find the issue
which caused the problem: an endpoint returning a NoContent status, but with
some text body.
Even though this is a server issue, the httpclient should not block the thread
for such a long time and also return a proper error so this kind of issues so
the cause is easier to track down. Now, if I would not have used Ning, I would
not have found the issue.
The problem occurred when using Fluent Api, but I assume to cause for the
thread to block and not return a proper error is in the HttpClient component.
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