Rewrite request Host header

[jRom42]

Hello,

A backend web service that used to work for years has stopped working because it looks like a control is now made on the Host header in the request.
The web service still works with a curl command when accessed without membrane.

This call works

curl --request POST   --url https://<**external_webservice_fqdn**>/service   \
  --header 'accept: application/json'   \
  --header 'content-type: application/x-www-form-urlencoded'     \  
  --data username=xxxxxxxxx   \
  --data password=xxxxxxxxxx

This call does not work anymore:

curl --request POST   --url https://<**membrane_fqdn**>/service   \
  --header 'accept: application/json'   \
  --header 'content-type: application/x-www-form-urlencoded'     \  
  --data username=xxxxxxxxx   \
  --data password=xxxxxxxxxx

My membrane version is 5.5.9

Service configuration is very simple:

<serviceProxy name="myservice" host="membrane.xxx.xx">
        <path>/service/path</path>


        <target url="https://<backend_server>">
                <ssl>
                        <truststore location="<jks_path>" password="xxxxxxxx"/>
                </ssl>
        </target>
</serviceProxy>

How can I overwrite the Host header before the request is sent to the target ?

I have tried with groovy and setHeader but none of them seem to work.

<request>
    <setHeader name="Host" value="xxxxxx" />
</request>

<groovy>
    exc.getRequest().getHeader().setHost("xxxxx");
    CONTINUE
</groovy>

Web service response

[predic8]

Hi,
Membrane automatically sets the host header according to the target element. You can turn that off by setting an attribute on router:

See: https://www.membrane-api.io/docs/current/router.html

Then your code snippets should work. But usually Membrane sets it to the right value. I would first check how the headers are set using a log inside your serviceProxy:

<serviceProxy name="myservice" host="membrane.xxx.xx">
        <path>/service/path</path>
        <log/>
        <target url="https://<backend_server>">
                <ssl>
                        <truststore location="<jks_path>" password="xxxxxxxx"/>
                </ssl>
        </target>
</serviceProxy>

Then make the call and have a look at the console.

Cheers
Thomas

[jRom42]

Hi Thomas,

Thank you for taking time to answer.
It works with adjustHostHeader="false" on serviceProxy (setting on router membrane fails with an error) and this groovy config:

<groovy>
    exc.getRequest().getHeader().setHost("xxxxx");
    CONTINUE
</groovy>