The URLRewrite Mediator is used to modify and transform the URL values available in messages. This can be done by defining a rewrite action for each fragment of a selected property value. Alternatively, you can rewrite the entire URL string at once.
The URLRewrite mediator is a content aware mediator.
The parameters available to configure the URL Rewrite mediator are as follows.
|In Property||This parameter is used to enter property of which the value should be considered the input URL. The rewrite rules are applied to the value of the property entered in this parameter to generate the result URL. If no property is entered, the rewrite rules will be applied to the |
|Out Property||This parameter is used to enter the property to which the transformations done via the rewrite rules should be applied. If no property is entered, the transformations will be applied to the |
The Rewrite mediator applies the URL transformations by evaluating a set of rules on the message. To add a rule to the mediator, click Add Rule. The rewrite rule will be added to the mediator tree as a child of the URLRewrite mediator (see the image below).
URLRewriteRule in the mediator tree to configure the rewrite rule you added. The following section will be displayed.
A rule can consist of one or more rewrite actions and an optional condition. The Condition parameter is used to enter the optional condition. If a condition is specified, it will be evaluated before the rewrite actions, and the rewrite actions will be executed only if the condition evaluates to
A rewrite action is added by clicking Add Action which would display the following row.
The parameters available to configure a rewrite action are as follows.
This parameter is used to specify the action to be performed by the rewrite action. Each rewrite action is performed on a fragment entered in the Fragment parameter. Possible values are as follows.
The fragment of the in property (i.e. input URL) for which the rewrite action should be performed. The available fragments are as follows.
Note that this breakdown is inline with the URI specification (RFC2396). URL rewrite mediator enables rewriting each of the above segments separately and finally combining them to get the final URL value. It also supports rewriting the entire URL string at once.
This parameter is used to define the result value of the rewrite action. Select one of the following.
|Value/Expression||This parameter is used to enter the result value of the URLRewrite mediator as a static value or an expression, depending on what you selected for the Option parameter.|
|Namespace Editor||You can click this link to add namespaces when you are providing an expression. Then the Namespace Editor panel would appear where you can provide any number of namespace prefixes and URLs used in the XPath expression.|
|Regex||This parameter is used to specify which part of the in property value fragment should be replaced by the result value if you selected |
|Delete||Click Delete in the relevant row to remove a rewrite action.|
You can configure the mediator using XML. Click switch to source view in the Mediator window.
In this example, the URLRewrite mediator has a rewrite action which replaces the value
soap with value
services in the fragment
path of the input URL. Since no in property or an out property is specified, the
To header of the request is both the input to which the rewrite rule is applied and the target where the result URL is set. This configuration is typically used when the address URL of a request contains the context
soap which needs to be converted since all the services are deployed under a context named
services in the ESB server. Thus, the URL
is rewritten as
/StockQuoteProxy1 to ensure that the requests are successfully delivered to the server.
For more examples, see: