Best way to have one Web API forward request to other

Question

I have a few web services running on different servers, and I want to have one web service running "in front" of the rest to decide which web service (server) the request should be forwarded to based on header values.

The idea is that a client will send a request, say:

http://api.mysite.com/cars

The API at mysite.com will inspect the request, extract information from the API key (which is supplied in the headers) and redirect to the appropriate server, e.g.

http://server4.mysite.com/api/cars

Is this going to work? I'm concerned about how I will return the response (w/data) from "server4" to the client. Will the response only be returned back to the first server or will the client achieve that response?

Answer 1

Just run into the same task and have to add some more lines in addition to Yazan Ati answer.

    [HttpPost]
    [HttpGet]
    [Route("api/TestBot/{*remaining}")]
    public Task<HttpResponseMessage> SendMessage()
    {
        const string host = "facebook.botframework.com";
        string forwardUri = $"https://{host}/api/v1/bots/billycom{Request.RequestUri.Query}";

        Request.Headers.Remove("Host");
        Request.RequestUri = new Uri(forwardUri);
        if (Request.Method == HttpMethod.Get)
        {
            Request.Content = null;
        }

        var client = new HttpClient();
        return client.SendAsync(Request, HttpCompletionOption.ResponseHeadersRead);
    }