When you use a wsdl metadata, it's possible to use a parameter as a part of the invocation url.
For that, you need to add a new 'Part' node in the 'Input' node and choose as Binding Type 'http:urlReplacement' :
This option means that the value given to this node will be replaced directly in the url.
For that, you have to insert the node in the url, by putting it between curly brackets :
If mapped with the value cityName = 'Paris', the end of the generated url will be :
/get?city=Paris
You can set up several parameters of the url.
In the following example, 3 nodes will be replaced in the url :
In this case, the end of the generated url will be :
/get?city=Paris&name[1]=Martin