REST Request -Track headers of requesr

Question

I am successfully making a Rest request as follows: Is there a way to trace the headers of the request and response

    prepareEndPoint();
    System.debug(endPoint);
    HttpRequest req=new HttpRequest();
    req.setEndpoint('Callout:EFS_URL/'+endPoint);
    req.setMethod('GET');
    req.setHeader('APP-UserID',efsUserId);
    req.setHeader('APP-Password',efsPassword);
    req.setHeader('MFC-ConversationUID','79832fec-796c-4dab-bdae-a28e7288e421');
    req.setHeader('MFC-ApplicationName','SFDC');
    req.setHeader('MFC-RequestDateTime','2015-09-19T01:13:57');
    req.setHeader('Content-Type','application/xml');
    req.setCompressed(true);
    Http http=new Http();
    System.debug(req);
    HttpResponse res=http.send(req);
    resultSet=res.getBody();

Answer 1

If you want to use it for debugging only but don't want to use System.debug , then you can track the request by

1. Creating a separate object and inserting a record for both request and response. (It will create a lot of records)
2. Sending an email with request and response as body(May hit your daily email limit)
3. Sending a request to RequestBin(www.requestb.in). It is site on which you can create your own bin and set the generated URL as the request endpoint. Then you can go to that bin and see the headers and request body. You cannot track responses via RequestBin unless other system is sending responses to RequestBin as well.

(It is free and I'm not affiliated to RequestBin)

P.S. Request bin URL should be added to remote site as well.