I'm trying to return a full HTTP-Response to the browser within an ASP.NET WebAPI Controller.
The scenario is the following: I make a remote call to another webserver and get a full HTTP-Message including the HTTP Headers and content. I just want do deliver this message "as is" to the browser.
Does anyone know how to do this?
Create your own IHttpHandler and configure a route for it. You have to copy all response headers from your own response to the response object of ASP.NET.
Here is a sample implementation for another scenario:
public class CorsProxyHttpHandler : IHttpHandler
{
public void ProcessRequest(HttpContext context)
{
var url = context.Request.Headers["X-CorsProxy-Url"];
if (url == null)
{
context.Response.StatusCode = 501;
context.Response.StatusDescription =
"X-CorsProxy-Url was not specified. The corsproxy should only be invoked from the proxy JavaScript.";
context.Response.End();
return;
}
try
{
var request = WebRequest.CreateHttp(url);
context.Request.CopyHeadersTo(request);
request.Method = context.Request.HttpMethod;
request.ContentType = context.Request.ContentType;
request.UserAgent = context.Request.UserAgent;
if (context.Request.AcceptTypes != null)
request.Accept = string.Join(";", context.Request.AcceptTypes);
if (context.Request.UrlReferrer != null)
request.Referer = context.Request.UrlReferrer.ToString();
if (!context.Request.HttpMethod.Equals("GET", StringComparison.OrdinalIgnoreCase))
context.Request.InputStream.CopyTo(request.GetRequestStream());
var response = (HttpWebResponse)request.GetResponse();
response.CopyHeadersTo(context.Response);
context.Response.ContentType = response.ContentType;
context.Response.StatusCode =(int) response.StatusCode;
context.Response.StatusDescription = response.StatusDescription;
var stream = response.GetResponseStream();
if (stream != null && response.ContentLength > 0)
{
stream.CopyTo(context.Response.OutputStream);
stream.Flush();
}
}
catch (WebException exception)
{
context.Response.AddHeader("X-CorsProxy-InternalFailure", "false");
var response = exception.Response as HttpWebResponse;
if (response != null)
{
context.Response.StatusCode = (int)response.StatusCode;
context.Response.StatusDescription = response.StatusDescription;
response.CopyHeadersTo(context.Response);
var stream = response.GetResponseStream();
if (stream != null)
stream.CopyTo(context.Response.OutputStream);
return;
}
context.Response.StatusCode = 501;
context.Response.StatusDescription = exception.Status.ToString();
var msg = Encoding.ASCII.GetBytes(exception.Message);
context.Response.OutputStream.Write(msg, 0, msg.Length);
context.Response.Close();
}
catch (Exception exception)
{
context.Response.StatusCode = 501;
context.Response.StatusDescription = "Failed to call proxied url.";
context.Response.AddHeader("X-CorsProxy-InternalFailure", "true");
var msg = Encoding.ASCII.GetBytes(exception.Message);
context.Response.OutputStream.Write(msg, 0, msg.Length);
context.Response.Close();
}
}
public bool IsReusable { get { return true; }}
}
(from my article: http://blog.gauffin.org/2014/04/how-to-use-cors-requests-in-internet-explorer-9-and-below/)
