protected virtual async Task ProcessRequest(HttpListenerContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var url = TargetUrl.GetComponents(UriComponents.SchemeAndServer, UriFormat.Unescaped);
using (var msg = new HttpRequestMessage(new HttpMethod(context.Request.HttpMethod), url + context.Request.RawUrl))
{
msg.Version = context.Request.ProtocolVersion;
if (context.Request.HasEntityBody)
{
msg.Content = new StreamContent(context.Request.InputStream); // disposed with msg
}
string host = null;
foreach (string headerName in context.Request.Headers)
{
var headerValue = context.Request.Headers[headerName];
if (headerName == "Content-Length" && headerValue == "0") // useless plus don't send if we have no entity body
{
continue;
}
bool contentHeader = false;
switch (headerName)
{
// some headers go to content...
case "Allow":
case "Content-Disposition":
case "Content-Encoding":
case "Content-Language":
case "Content-Length":
case "Content-Location":
case "Content-MD5":
case "Content-Range":
case "Content-Type":
case "Expires":
case "Last-Modified":
contentHeader = true;
break;
case "Referer":
if (RewriteReferer && Uri.TryCreate(headerValue, UriKind.Absolute, out var referer)) // if relative, don't handle
{
var builder = new UriBuilder(referer);
builder.Host = TargetUrl.Host;
builder.Port = TargetUrl.Port;
headerValue = builder.ToString();
}
break;
case "Host":
host = headerValue;
if (RewriteHost)
{
headerValue = TargetUrl.Host + ":" + TargetUrl.Port;
}
break;
}
if (contentHeader)
{
msg.Content.Headers.Add(headerName, headerValue);
}
else
{
msg.Headers.Add(headerName, headerValue);
}
}
using (var response = await _client.SendAsync(msg).ConfigureAwait(false))
{
using (var os = context.Response.OutputStream)
{
context.Response.ProtocolVersion = response.Version;
context.Response.StatusCode = (int)response.StatusCode;
context.Response.StatusDescription = response.ReasonPhrase;
foreach (var header in response.Headers)
{
context.Response.Headers.Add(header.Key, string.Join(", ", header.Value));
}
foreach (var header in response.Content.Headers)
{
if (header.Key == "Content-Length") // this will be set automatically at dispose time
{
continue;
}
context.Response.Headers.Add(header.Key, string.Join(", ", header.Value));
}
var ct = context.Response.ContentType;
if (RewriteTargetInText && host != null && ct != null &&
(ct.IndexOf("text/html", StringComparison.OrdinalIgnoreCase) >= 0 ||
ct.IndexOf("application/json", StringComparison.OrdinalIgnoreCase) >= 0))
{
using (var ms = new MemoryStream())
{
using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
await stream.CopyToAsync(ms).ConfigureAwait(false);
var enc = context.Response.ContentEncoding ?? Encoding.UTF8;
var html = enc.GetString(ms.ToArray());
if (TryReplace(html, "//" + _targetHost + ":" + _targetPort + "/", "//" + host + "/", out var replaced))
{
var bytes = enc.GetBytes(replaced);
using (var ms2 = new MemoryStream(bytes))
{
ms2.Position = 0;
await ms2.CopyToAsync(context.Response.OutputStream).ConfigureAwait(false);
}
}
else
{
ms.Position = 0;
await ms.CopyToAsync(context.Response.OutputStream).ConfigureAwait(false);
}
}
}
}
else
{
using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
await stream.CopyToAsync(context.Response.OutputStream).ConfigureAwait(false);
}
}
}
}
}
}
protected virtual async Task ProcessRequestAsync(HttpListenerContext context)
{
if (context == null)
{
throw new ArgumentNullException(nameof(context));
}
var url = TargetUrl.GetComponents(UriComponents.SchemeAndServer, UriFormat.Unescaped);
using (var msg = new HttpRequestMessage(new HttpMethod(context.Request.HttpMethod), url + context.Request.RawUrl))
{
msg.Version = context.Request.ProtocolVersion;
if (context.Request.HasEntityBody)
{
var stream = context.Request.InputStream;
msg.Content = new StreamContent(stream); // disposed with msg
}
foreach (string headerName in context.Request.Headers)
{
var contentHeader = false;
var headerValue = context.Request.Headers[headerName];
switch (headerName)
{
// these headers go to content...
case "Allow":
case "Content-Disposition":
case "Content-Encoding":
case "Content-Language":
case "Content-Length":
case "Content-Location":
case "Content-MD5":
case "Content-Range":
case "Content-Type":
case "Expires":
case "Last-Modified":
contentHeader = true;
break;
// rewrite referer
case "Referer":
if (Uri.TryCreate(headerValue, UriKind.Absolute, out var referer)) // if relative, don't handle
{
var builder = new UriBuilder(referer);
builder.Host = TargetUrl.Host;
builder.Port = TargetUrl.Port;
headerValue = builder.ToString();
}
break;
// rewrite host
case "Host":
headerValue = TargetUrl.Host + ":" + TargetUrl.Port;
break;
}
if (contentHeader)
{
msg.Content.Headers.Add(headerName, headerValue);
}
else
{
msg.Headers.Add(headerName, headerValue);
}
}
using (var response = await _client.SendAsync(msg).ConfigureAwait(false))
{
using (var os = context.Response.OutputStream)
{
context.Response.StatusCode = (int)response.StatusCode;
context.Response.StatusDescription = response.ReasonPhrase;
context.Response.ProtocolVersion = response.Version;
foreach (var header in response.Headers)
{
context.Response.Headers.Add(header.Key, string.Join(", ", header.Value));
}
foreach (var header in response.Content.Headers)
{
if (header.Key == "Content-Length") // this will be set automatically at dispose time
{
continue;
}
context.Response.Headers.Add(header.Key, string.Join(", ", header.Value));
}
using (var stream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
{
await stream.CopyToAsync(context.Response.OutputStream).ConfigureAwait(false);
}
}
}
}
}