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In Camel 1.5 the following algorithm is used to determine if either GET or POST http HTTP method should be used:
1. Use method provided in header.
2. GET is if query string is provided in header.
3. GET if endpoint is configured with a query string.
4. POST if there is data to send (body is not null).
5. GET otherwise.

Configuring URI to call

You can set the http HTTP producer's URI directly form the endpoint URI. In the route below, Camel will call our out to the external server, oldhost, using HTTP.

from("direct:start")
	    .to("http://oldhost");

And the equivalent spring Spring sample:

<camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <to uri="http://oldhost"/>
  </route>
</camelContext>

In Camel 1.5.1 you can override the http HTTP endpoint URI by adding a header with the key, HttpProducer.HTTP_URI, on the message.

from("direct:start")
            .setHeader(org.apache.camel.component.http.HttpProducer.HTTP_URI, constant("http://newhost"))
	    .to("http://oldhost");

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Where Constants is the class, org.apache.camel.component.http.Constants.

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.setHeader("CamelHttpMethod", constant("POST"))

And the equivalent spring Spring sample:

<camelContext xmlns="http://activemq.apache.org/camel/schema/spring">
  <route>
    <from uri="direct:start"/>
    <setHeader headerName="CamelHttpMethod">
        <constant>POST</constant>
    </setHeader>
    <to uri="http://www.google.com"/>
    <to uri="mock:results"/>
  </route>
</camelContext>

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There is also support for proxy authentication via the proxyUsername and proxyPassword options.

Using proxy settings from Java System Properties

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Configuring charset

If you are using POST to send data you can configure the charset using the Exchange property:

exchange.setProperty(Exchange.CHARSET_NAME, "iso-8859-1");

Or the HttpClient httpClient options: httpClient.contentCharset=iso-8859-1

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The sample polls the Google homepage every 10 seconds and write the page to the file message.html:

from("timer://foo?fixedRate=true&delay=0&period=10000")
    .to("http://www.google.com")
    .setHeader(FileComponent.HEADER_FILE_NAME, "message.html").to("file:target/google");

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In this sample we have the complete URI endpoint that is just what you would have typed in a web browser. Multiple URI parameters can of course be set using the & character as separator, just as you would in the web browser. Camel does no tricks here.

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In the header value above notice that it should not be prefixed with ? and you can separate parameters as usual with the & char.

Getting the Response Code

You can get the http HTTP response code from the http HTTP component by getting the value from out the Out message header with HttpProducer.HTTP_RESPONSE_CODE.

Exchange exchange = template.send("http://www.google.com/search", new Processor() {
            public void process(Exchange exchange) throws Exception {
                exchange.getIn().setHeader(HttpProducer.QUERY, constant("hl=en&q=activemq"));
            }
   });
   Message out = exchange.getOut();
   int responseCode = out.getHeader(HttpProducer.HTTP_RESPONSE_CODE, Integer.class);

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Available as of Camel 2.0
In the route below we want to route a message that we enrich with data returned from a remote HTTP call. As we want any response from the remote server, we set the throwExceptionOnFailure option to false so we get any response in the AggregationStrategy. As the code is based on an a unit test that simulates a http HTTP status code 404, there is some assertion code etc.

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To disable cookies you can set the Http HTTP Client to ignore cookies by adding this URI option:
httpClient.cookiePolicy=ignoreCookies

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If you need more control over the http HTTP producer you should use the HttpComponent where you can set various classes to give you custom behavior.

Setting MaxConnectionsPerHost

The Http Component have has a org.apache.commons.httpclient.HttpConnectionManager where you can configure various global configuration for the given component.
By global, we mean , that any endpoint the component creates has the same shared HttpConnectionManager. So, if we want to set a different value for the max connection per host, we need to define it on the http HTTP component and not on the endpoint URI that we usually usesuse. So here comes:

First, we define the http component in spring Spring XML. Yes, we can use the same scheme name, http that , because otherwise Camel otherwise will auto-discover and create the component with default settings. What we need is to overrule this so we can set our options. In the sample below we set the max connection to 5 instead of the default of 2.

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