Do not send response headers at all

https://stackoverflow.com/questions/16793535

30-05-2022
|

سؤال

I have tiny Java web application backed by Apache Camel. It uses Camel's servlet component. This application is meant to be connector and receive data from devices.

As far as we pay for traffic I am interesting if there is a way to deny all response headers from web server and send only status code.

Update:

from("servlet:///channel?servletName=ChannelServlet")

...

.split().method("objectSplitter", "splitRootObject")
.log("before removeHeaders")
.removeHeaders("*")
.log("after removeHeaders")
.process(new Processor() {

    @Override
    public void process(Exchange exchange) throws Exception {
        Message out = exchange.getOut();
        out.removeHeaders("*");
        out.setHeader("custom", "custom");
        out.setHeader(Exchange.HTTP_RESPONSE_CODE, "200");
        out.setBody("");
        LOG.debug("In processor");
    }
});

I am always receiving:

HTTP/1.1 200 OK
Transfer-Encoding: chunked
Host: localhost:8080
charset: utf-8
breadcrumbId: ID-eclipse-46977-1369749855622-0-2
User-Agent: Java/1.7.0_21
Accept: text/html, image/gif, image/jpeg, *; q=.2, */*; q=.2
Content-Type: application/octet-stream
Server: Jetty(7.6.8.v20121106)

At the end of stacktrace:

[          http-bio-9080-exec-5] route1                         INFO  before removeHeaders
[          http-bio-9080-exec-5] Tracer                         INFO  ID-eclipse-43869-1369751726247-0-12 >>> (route1) log[before removeHeaders] --> removeHeaders[*] <<< Pattern:InOut, Headers:{frame=0, imei=393090335172229, type=SdkMsgFrame, genTime=0, breadcrumbId=ID-eclipse-43869-1369751726247-0-11, key=2aa4678e-2eb8-42c2-9b59-2e816c276cd5, numFrames=1}, BodyType:String, Body:eNo1...Q1GJ+
[          http-bio-9080-exec-5] Tracer                         INFO  ID-eclipse-43869-1369751726247-0-12 >>> (route1) removeHeaders[*] --> log[after removeHeaders] <<< Pattern:InOut, BodyType:String, Body:eNo1...Q1GJ+
[          http-bio-9080-exec-5] route1                         INFO  after removeHeaders
[          http-bio-9080-exec-5] Tracer                         INFO  ID-eclipse-43869-1369751726247-0-12 >>> (route1) log[after removeHeaders] --> com.succorfish.harbour.http.route.ServletRoute$1@17968bee <<< Pattern:InOut, BodyType:String, Body:eNo1...Q1GJ+
[          http-bio-9080-exec-5] ServletRoute                   DEBUG In processor
[          http-bio-9080-exec-5] MulticastProcessor             DEBUG Done sequential processing 1 exchanges

المحلول 2

The final answer to this question is that you can remove most of headers from Camel but Tomcat/Jetty will append some of them anyway. The smallest headers I have got were:

Date: Thu, 30 May 2013 09:49:30 GMT
Transfer-Encoding: chunked
Content-Length: 0
Server: Apache-Coyote/1.1

This is still unacceptable in my case, so I will use Apache Mina and UDP/TCP instead of HTTP.

نصائح أخرى

You can tell Camel to remove all headers at the end of the route. Then the response dont have any headers.

from("jetty:...")
   ...
   .removeHeaders("*");

See some of these pages also

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