FiddlerScript: proxy QUERY STRING and POST data in autoresponder - proxy

Question

On the Autoresponder I map a certain endpoint to respond to a certain URL request received.
I would like the endpoint receives the QUERY STRING and POST DATA, too.
I thought it was possible through the "REGEX:" wrapper in the rule, but it cannot capture any subexpression to pass to the mapped endpoint.
Can it be done through FiddlerScript? How to reference request and mapped endpoint?

Answer 1

This solution in C# allows to incercept the request to www.example-1.com and forward it to www.example-2.com, chaining possible query string and filling POSTDATA if given:
// match regex
string regex = "example-1.com/somepath/.*";
Regex rgx = new Regex(regex);
Match match = rgx.Match(oSession.fullUrl);
if (match.Success) {
// GET request -> replace the original URL with "https://www.example-2.com"
if (oSession.HTTPMethodIs("GET")) {
string qs = oSession.fullUrl.Split('?')[1];
oSession.fullUrl = oSession.fullUrl.Replace(oSession.fullUrl, "https://www.example-2.com/path?" + qs);
} else if (oSession.HTTPMethodIs("POST")) {
// Create an HTTP request to www.example-2.com and forward the request body saved above:
oSession.utilCreateResponseAndBypassServer();
var reqBody = oSession.GetRequestBodyAsString();
var data = Encoding.ASCII.GetBytes(reqBody);
var request = (HttpWebRequest)WebRequest.Create("https://plugvue.com/test/request-parser/api-write.php");
request.Method = "POST";
request.ContentType = "application/x-www-form-urlencoded";
request.ContentLength = data.Length;
using (var stream = request.GetRequestStream()) {
stream.Write(data, 0, data.Length);
}
var response = (HttpWebResponse)request.GetResponse();
var responseString = new StreamReader(response.GetResponseStream()).ReadToEnd();
}
}
It has to be put inside the OnBeforeRequest(Session oSession) handler.