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ClientHandler.cs
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ClientHandler.cs
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// Copyright (c) .NET Foundation. All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IO;
using System.IO.Pipelines;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting.Server;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Http.Features;
using Microsoft.Net.Http.Headers;
namespace Microsoft.AspNetCore.TestHost
{
/// <summary>
/// This adapts HttpRequestMessages to ASP.NET Core requests, dispatches them through the pipeline, and returns the
/// associated HttpResponseMessage.
/// </summary>
public class ClientHandler : HttpMessageHandler
{
private readonly ApplicationWrapper _application;
private readonly PathString _pathBase;
/// <summary>
/// Create a new handler.
/// </summary>
/// <param name="pathBase">The base path.</param>
/// <param name="application">The <see cref="IHttpApplication{TContext}"/>.</param>
internal ClientHandler(PathString pathBase, ApplicationWrapper application)
{
_application = application ?? throw new ArgumentNullException(nameof(application));
// PathString.StartsWithSegments that we use below requires the base path to not end in a slash.
if (pathBase.HasValue && pathBase.Value.EndsWith("/"))
{
pathBase = new PathString(pathBase.Value[..^1]); // All but the last character
}
_pathBase = pathBase;
}
internal bool AllowSynchronousIO { get; set; }
internal bool PreserveExecutionContext { get; set; }
/// <summary>
/// This adapts HttpRequestMessages to ASP.NET Core requests, dispatches them through the pipeline, and returns the
/// associated HttpResponseMessage.
/// </summary>
/// <param name="request"></param>
/// <param name="cancellationToken"></param>
/// <returns></returns>
protected override async Task<HttpResponseMessage> SendAsync(
HttpRequestMessage request,
CancellationToken cancellationToken)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
var contextBuilder = new HttpContextBuilder(_application, AllowSynchronousIO, PreserveExecutionContext);
var requestContent = request.Content;
if (requestContent != null)
{
// Read content from the request HttpContent into a pipe in a background task. This will allow the request
// delegate to start before the request HttpContent is complete. A background task allows duplex streaming scenarios.
contextBuilder.SendRequestStream(async writer =>
{
if (requestContent is StreamContent)
{
// This is odd but required for backwards compat. If StreamContent is passed in then seek to beginning.
// This is safe because StreamContent.ReadAsStreamAsync doesn't block. It will return the inner stream.
var body = await requestContent.ReadAsStreamAsync();
if (body.CanSeek)
{
// This body may have been consumed before, rewind it.
body.Seek(0, SeekOrigin.Begin);
}
await body.CopyToAsync(writer);
}
else
{
await requestContent.CopyToAsync(writer.AsStream());
}
await writer.CompleteAsync();
});
}
contextBuilder.Configure((context, reader) =>
{
var req = context.Request;
if (request.Version == HttpVersion.Version20)
{
// https://tools.ietf.org/html/rfc7540
req.Protocol = HttpProtocol.Http2;
}
else
{
req.Protocol = "HTTP/" + request.Version.ToString(fieldCount: 2);
}
req.Method = request.Method.ToString();
req.Scheme = request.RequestUri.Scheme;
var canHaveBody = false;
if (requestContent != null)
{
canHaveBody = true;
// Chunked takes precedence over Content-Length, don't create a request with both Content-Length and chunked.
if (request.Headers.TransferEncodingChunked != true)
{
// Reading the ContentLength will add it to the Headers‼
// https://github.com/dotnet/runtime/blob/874399ab15e47c2b4b7c6533cc37d27d47cb5242/src/libraries/System.Net.Http/src/System/Net/Http/Headers/HttpContentHeaders.cs#L68-L87
var contentLength = requestContent.Headers.ContentLength;
if (!contentLength.HasValue && request.Version == HttpVersion.Version11)
{
// HTTP/1.1 requests with a body require either Content-Length or Transfer-Encoding: chunked.
request.Headers.TransferEncodingChunked = true;
}
else if (contentLength == 0)
{
canHaveBody = false;
}
}
foreach (var header in requestContent.Headers)
{
req.Headers.Append(header.Key, header.Value.ToArray());
}
if (canHaveBody)
{
req.Body = new AsyncStreamWrapper(reader.AsStream(), () => contextBuilder.AllowSynchronousIO);
}
}
context.Features.Set<IHttpRequestBodyDetectionFeature>(new RequestBodyDetectionFeature(canHaveBody));
foreach (var header in request.Headers)
{
// User-Agent is a space delineated single line header but HttpRequestHeaders parses it as multiple elements.
if (string.Equals(header.Key, HeaderNames.UserAgent, StringComparison.OrdinalIgnoreCase))
{
req.Headers.Append(header.Key, string.Join(" ", header.Value));
}
else
{
req.Headers.Append(header.Key, header.Value.ToArray());
}
}
if (!req.Host.HasValue)
{
// If Host wasn't explicitly set as a header, let's infer it from the Uri
req.Host = HostString.FromUriComponent(request.RequestUri);
if (request.RequestUri.IsDefaultPort)
{
req.Host = new HostString(req.Host.Host);
}
}
req.Path = PathString.FromUriComponent(request.RequestUri);
req.PathBase = PathString.Empty;
if (req.Path.StartsWithSegments(_pathBase, out var remainder))
{
req.Path = remainder;
req.PathBase = _pathBase;
}
req.QueryString = QueryString.FromUriComponent(request.RequestUri);
});
var response = new HttpResponseMessage();
// Copy trailers to the response message when the response stream is complete
contextBuilder.RegisterResponseReadCompleteCallback(context =>
{
var responseTrailersFeature = context.Features.Get<IHttpResponseTrailersFeature>();
foreach (var trailer in responseTrailersFeature.Trailers)
{
bool success = response.TrailingHeaders.TryAddWithoutValidation(trailer.Key, (IEnumerable<string>)trailer.Value);
Contract.Assert(success, "Bad trailer");
}
});
var httpContext = await contextBuilder.SendAsync(cancellationToken);
response.StatusCode = (HttpStatusCode)httpContext.Response.StatusCode;
response.ReasonPhrase = httpContext.Features.Get<IHttpResponseFeature>().ReasonPhrase;
response.RequestMessage = request;
response.Version = request.Version;
response.Content = new StreamContent(httpContext.Response.Body);
foreach (var header in httpContext.Response.Headers)
{
if (!response.Headers.TryAddWithoutValidation(header.Key, (IEnumerable<string>)header.Value))
{
bool success = response.Content.Headers.TryAddWithoutValidation(header.Key, (IEnumerable<string>)header.Value);
Contract.Assert(success, "Bad header");
}
}
return response;
}
}
}