Provide a way to read an InputStream with RestTemplate [SPR-7357]

[spring-projects-issues]

Evgeny Goldin opened SPR-7357 and commented

Please, see http://forum.springsource.org/showthread.php?t=91713
Today I need to "abandon" RestTemplate when I need to read a raw binary response as InputStream and not as in-memory byte[]

Thank you!

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Affects: 3.0.3

Issue Links:

• SimpleClientHttpResponse.close() does not call close() on URLConnection.getInputStream() if SimpleClientHttpResponse.getBody() was not called before [SPR-17181] #21717 SimpleClientHttpResponse.close() does not call close() on URLConnection.getInputStream() if SimpleClientHttpResponse.getBody() was not called before

[spring-projects-issues]

Arjen Poutsma commented

You can already read an InputStream by using the execute() method on the RestTemplate in combination with a ResponseExtractor implementation, see here.

Note that you cannot simply return the InputStream from the extractor, because by the time the execute method returns, the underlying connection and stream are already closed.

[spring-projects-issues]

Evgeny Goldin commented

Oh, that's good, thank you.

But I'm using an exchange() call in order to set an HTTP header with HttpEntity before sending a request.
Seems like I can't get to InputStream in this case, is that correct?

[spring-projects-issues]

Arjen Poutsma commented

That is correct, but you can, however, get to the HTTP headers from the execute method.

[spring-projects-issues]

Evgeny Goldin commented

Yes, it worked! I now use RestTemplate for all requests.

Note that you cannot simply return the InputStream from the extractor, because by the time the execute method returns, the underlying connection and stream are already closed

That was important. Indeed, I could only read an InputStream inside ResponseExtractor.extractData ( ClientHttpResponse )

Many thanks for your help, Arjen.

[spring-projects-issues]

Daniel Dacar commented

Why is the InputStream closed? This forces the client to store the stream in memory or in I/O instead of passing it to other layers for processing.

[spring-projects-issues]

Andrey Beletsky commented

Evgeny Goldin I also wonder why? Could you explain, please? Or send a link where it is already explained. It is very important not to fully read it in memory.