public static async Task <HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequestMessage req, TraceWriter log)
{
// Get request body
CorsProxyRequest data = await req.Content.ReadAsAsync <CorsProxyRequest>();
var resp = await ProxyOther(data);
return(req.CreateResponse(HttpStatusCode.OK, resp, "application/json"));
}
public static async Task <CorsProxyResponse> ProxyOther(CorsProxyRequest req)
{
try
{
//IGNORE SSL ERRORS AND FORCE USAGE OF KNOWN ALGORITHM.
ServicePointManager.ServerCertificateValidationCallback = delegate { return(true); };
ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls
| SecurityProtocolType.Tls11
| SecurityProtocolType.Tls12
| SecurityProtocolType.Ssl3;
var requesturl = new Uri(req.url);
HttpClientHandler httpClientHandler = new HttpClientHandler()
{
AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate
};
httpClientHandler.CookieContainer = new CookieContainer();
HttpClient httpClient = new HttpClient(httpClientHandler);
httpClient.MaxResponseContentBufferSize = 256000;
var propfindMethod = new HttpMethod(req.method);
var propfindHttpRequestMessage = new HttpRequestMessage(propfindMethod, req.url);
var ctEncoding = Encoding.UTF8;
if (req.method.ToLower() != "get")
{
propfindHttpRequestMessage.Content = new StringContent(req.body);
}
//HEADER
if (req.headers != null)
{
for (int i = 0; i < req.headers.Count; i++)
{
var header = req.headers[i];
if (!header.Contains(":"))
{
continue;
}
var headerkey = header.Split(':')[0];
var headervalue = header.Split(':')[1];
//Content-Type
if (headerkey.ToLower() == "content-type")
{
if (req.method.ToLower() == "get")
{
continue;
}
if (headervalue.ToLower().Contains("charset"))
{
ctEncoding = StringToEncoding(headervalue.ToLower());
}
if (headervalue.Contains(";"))
{
headervalue = headervalue.Split(';')[0];
}
propfindHttpRequestMessage.Content = new StringContent(req.body, ctEncoding,
headervalue.Replace(" ", String.Empty));
continue; //adding this to request headers causes Misused header error
}
//COOKIES
if (headerkey.ToLower() == "cookie")
{
var cookies = headervalue.Replace(" ", String.Empty).Split(';');
foreach (var cookie in cookies)
{
var name = cookie.Split('=')[0];
var value = cookie.Split('=')[1];
httpClientHandler.CookieContainer.Add(requesturl, new Cookie(name, value));
}
continue; //adding this to request headers causes Misused header error
}
propfindHttpRequestMessage.Headers.Add(headerkey, headervalue);
}
}
var propfindHttpResponseMesage = await httpClient.SendAsync(propfindHttpRequestMessage);
var respheaders = propfindHttpResponseMesage.Headers.ToString();
var ctheaders = propfindHttpResponseMesage.Content.Headers;
var ggg = string.Join("\r\n", ctheaders.Select(h => h.Key + ": " + string.Join(", ", h.Value)));
respheaders = respheaders + string.Join("\r\n", ggg) + "\r\n";
string respbody = await propfindHttpResponseMesage.Content.ReadAsStringAsync();
var ctlength = propfindHttpResponseMesage.Content.Headers.ContentLength != null?propfindHttpResponseMesage.Content.Headers.ContentLength.ToString() : "0";
respheaders = respheaders + string.Join("\r\n", "Content-Length: " + ctlength);
return(new CorsProxyResponse()
{
success = true,
details = new List <string>(),
message = "",
url = req.url,
method = req.method,
reqbody = req.body,
reqheaders = req.headers == null ? "" : string.Join("\r\n", req.headers),
respbody = respbody,
respheaders = respheaders,
bodySize = int.Parse(ctlength).ToString("# ##0"),
protocol = "HTTP/1.1"
});
}
catch (Exception e)
{
var hostmismatch = false;
var hostheader = req.headers.FirstOrDefault(x => x.ToLowerInvariant().Contains("host:"));
if (hostheader != null)
{
var headervalue = hostheader.Split(':')[1];
if (!req.url.ToLowerInvariant().Contains(headervalue.Replace(" ", String.Empty)))
{
hostmismatch = true;
}
}
if (e.InnerException != null)
{
return new CorsProxyResponse()
{
details = new List <string>()
{
e.InnerException.Message
},
message = e.InnerException.Message + (hostmismatch ? " " + "It appears your host header is not the same as request url. This may be the cause? Try removing it completely or set it to be correct." : ""),
success = false,
url = req.url,
method = req.method,
reqbody = req.body,
reqheaders = req.headers == null ? "" : string.Join("\r\n", req.headers),
protocol = "HTTP/1.1",
bodySize = "0"
}
}
;
else
{
return(new CorsProxyResponse()
{
details = new List <string>()
{
e.Message
},
message = e.Message + (hostmismatch ? " " + "It appears your host header is not the same as request url. This may be the cause? Try removing it completely or set it to be correct." : ""),
success = false,
url = req.url,
method = req.method,
reqbody = req.body,
reqheaders = req.headers == null ? "" : string.Join("\r\n", req.headers),
protocol = "HTTP/1.1",
bodySize = "0"
});
}
}
}
