Can't convert HTTP Response with no Content-Type to String

[jamie3_james.archibald]

I have a case where I am doing an HTTP POST to a web server and the response is text but camel cannot convert the body to a string. Instead the conversion results in an empty string.

from("timer://foo")

.to("http://somehost/bar")

.convertBodyTo(String.class)

// this results in an empty string

.log("$");

I examined the response body and it is a CachedOutputStream$WrappedInputStream. If I introspect through the body I can see the actual text that the server is responding with.

I turned on debugging for the camel http component and it is saying that the Content-Type isn't found in the http response. Would this contribute to the problem?

My only work around is to write my own type converter, however I was hoping camel's built in type converters could handle this.

Or I was hoping to somehow force the http endpoint to read the response as text.

[njiang]

I went through the camel-http trunk code, the response content-type is optional.

I also did some test with the camel HttpProducer, I can get the response if there is no Content-Type.

So I just want to ask you some question:

What version of camel are you using?

Did you add any custom type converter yourself?

Does your web server use gzip to compress the data?

Willem

[jamie3_james.archibald]

Here's what I've had to do to be able to perform my conversion.

from("timer://foo")

.to("http://.....")

.process(new Processor() {

   // for some reason the cached data output stream has already read the inputstream

   // so we need to reset the stream position in order for the converters to grab the data

public void process(Exchange exg) {

     InputStream in = exg.getIn().getBody(InputStream.class);

      in.reset();

  }

})

.convertBodyTo(String.class)

.log("$") // no longer outputs an empty string

[jamie3_james.archibald]

im using camel.2.8.0-fuse-01-11

no gzip

[jamie3_james.archibald]

I think i found the problem. In my real code I spit out the response from the HTTP GET. The logging EIP seems to read the inputstream which moves the position to the end of the buffer.

// this fails

from("timer://foo")

.log("$") .convertBodyTo(String.class) .log("$") // empty string

If i convert the response to a string first, then the output in the log is valid

// this works

from("timer://foo")

.convertBodyTo(String.class)

.log("$") // non empty string

[njiang]

As the message body is a stream, you should enable the stream cache to let camel consume it more than one.

Willem

[jamie3_james.archibald]

Thanks! I'll keep that in mind.

The HTTP response payloads are very small so converting to String does the trick.