My target endpoint is giving 404 not fount. It is working fine if I hit my target endpoint direct from portman. I checked all headers and params, they are being passed correctly. I tried with http://mocktarget.apigee.net/echo It is also working fine....

I'm adding a user-agent header in assign message policy in pre flow of proxy endpoint. It is being shown in trace but not getting passed to the target endpoint. I checked the curl it made, user agent header is not there.I'm setting header like this :...