How to force apigee proxy to rewrite response URLs from target URL to proxy URL with base path

Question

I've created proxy for my REST API:

• Default Target Endpoint URL: http://products.example.com
• Default Proxy Endpoint Base Path: /products/v2
• Proxy URL: http://example.apigee.net/products/v2

When you call target endpoint directly, example:

POST http://products.example.com/items 

you'll get response with location header like this

http://products.example.com/items/123131

But if I go through proxy:

POST http://example.apigee.net/products/v2/items 

then location header for newly created resource still points to target URL:

http://products.example.com/items/3423423

But I expected to get

http://example.apigee.net/products/v2/items/3423423

The question is: how to configure proxy to rewrite URLs in response to Proxy URLs?

Answer 1

Not sure if this helps much but I raised a very similar question to yours at How do you correctly return Location headers and do HATEOAS with Apigee? . We ended up needing to write our own policy which does a simple search and replace on the response received from the target server. It would be nice if something was provided out of the box.

Answer 2

Apigee proxy allows you to add policies in the response part of a flow. Example below:

<Flows>
        <Flow name="myFlow">
            <Description></Description>
            <Request/>
            <Response>
               <Step>
                    <Name>ModifyLocationHeaderPolicy</Name>
               </Step>
            <Response/>
        </Flow>
</Flows>

I suggest you to add a javascript or python or java callout policy which will read the Location header of the response and re-write it. Something to the effect like below in Javascript

locationHeader = context.getVariable("message.header.Location");
// modify it
 context.setVariable("message.header.Location", locationHeader);