Proxy with custom response Headers

[Rohit Goyal]

I want to proxy a HTTP URL which I could do successfully.

But my requirement also says that with response, I need to add some additional header. It means once my backend sends response back to Mountebank, before Mountebank sends response back to consumer/client application, it should add some custom header. Please suggest how it's possible? 

I couldn't find any option with stub proxy to customize received server response before sending back to client application.

[Brandon Byars]

You're right Rohit - that is not currently supported.  It sounds like a good suggestion; I will add it as time allows.

-Brandon

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[Brandon Byars]

Actually I spoke too soon.  You can do this with the inject resolver, but it's going to be complicated.  In general, the inject resolver is used to support extending mountebank with good ideas that I simply never thought about to buy time to implement those good ideas in an easier way.

The inject documentation demonstrates creating a proxy: http://www.mbtest.org/docs/api/injection.  The function, copied and slightly modified from the docs, should come close to what you want; it will behave similarly to a proxyOnce proxy:

function (request, state, logger, callback) {

    var cacheKey = request.method + ' ' + request.path;

    if (typeof state.requests === 'undefined') {

        state.requests = {};

    }

    if (state.requests[cacheKey]) {

        logger.info('Using previous response');

        callback(state.requests[cacheKey]);

    }

    var http = require('http'),

        options = {

            method: request.method,

            hostname: 'localhost',

            port: 5555,

            path: request.path,

            headers: request.headers

        },

        httpRequest = http.request(options, function (response) {

            var body = '';

            response.setEncoding('utf8');

            response.on('data', function (chunk) {

                body += chunk;

            });

            response.on('end', function () {

                var stubResponse = {

                        statusCode: response.statusCode,

                        headers: response.headers,

                        body: body

                    };

                // Add custom header

                stubResponse.headers['X-Custom'] = 'Testing...'

                logger.info('Successfully proxied: ' + JSON.stringify(stubResponse));

                state.requests[cacheKey] = stubResponse;

                callback(stubResponse);

            });

        });

    httpRequest.end();

}

[Brandon Byars]

v1.2.0 now supports a simpler solution to this using the new decorate behavior.  This particular example is documented on http://www.mbtest.org/docs/api/behaviors.

-Brandon