CODEWITHSUNDEEP
http-headersapache-cameluridslquery-string
Jundl
Jundl

Reputation: 3234

apache-camel: http query string parameter as headers?

I'm new to camel and prefer using Spring DSL for route definition. Now I find it's confusing, that http query string parameter are named and handled as headers, what they aren't. Is this an architectural bug in camel?

Upvotes: 7

Views: 33836

Answers (3)

Rui Liu
Rui Liu

Reputation: 51

You can use toD. For example:

from("direct:mycode")
  .toD("https://myurl?param1=${header.param1}");

Upvotes: 2

adityagerrard
adityagerrard

Reputation: 48

Another way to solve is use toD component ( SendDynamicProcessor) and internally invoke URL using http4 component.

Use camel-http4 2.X.X. & from Camel 3.X http4 is merged to http.

I'm sharing a way you can generalize and control few things.

  1. uri can be dynamically set.
  2. Param can be added dynamically when required.

  3. You can this route to invoke different endpoints with few config values (headers, body, GET/POST, query params etc).

    <!-- param will be List or Array of String key=value and make toString to create query of format key1=value1&key2=value2 -->
<route id="httpInvoker">
   <from uri="direct:httpInvoker"/>
   <setHeader headerName="CamelHttpQuery"><simple>ref:param_bean<simple></setHeader>
   <setHeader headerName="CamelHttpUri"><simple>ref:uri_bean<simple></setHeader>
   <toD uri="http4:\\some-example.com">
<route>

Upvotes: 0

usha
usha

Reputation: 29349

Incoming http requests will be added as headers on the exchange with the same name as the query parameter.

Below example is from camel documentation

For example, given a client request with the URL, http://myserver/myserver?orderid=123, the exchange will contain a header named orderid with the value 123.

You can set the query parameters for other HTTP calls you make by setting by CamelHttpQuery header. Exchange.HTTP_QUERY is the static constant for string CamelHttpQuery

Eg:

from("jetty://0.0.0.0:8080/test")
    .setHeader(Exchange.HTTP_QUERY, simple("?param1=${header.param1}")
    .to("http://external-url/test")

Upvotes: 8

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