/// <summary>
/// This is the method that is called to configure the <see cref="NetStd20HttpRequest.RequestClient"/>
/// and <see cref="NetStd20HttpRequest.RequestHandler"/> returned by <see cref="CreateWebRequest(string, Uri)"/>.
/// </summary>
/// <param name="request">Value returned by <see cref="CreateWebRequest(string, Uri)"/>.</param>
protected override NetStd20HttpRequest ConfigureWebRequest(NetStd20HttpRequest request)
{
// Must ensure this method is thread-safe because the parent method will update
// NetStd20HttpRequest.RequestHandler properties, which is really just calling NamedHttpClientHandlerWrapper.
// We don't want multiple threads to be updating NamedHttpClientHandlerWrapper properties at the same
// time because the wrapped HttpClientHandler properties are probably not thread-safe, and we don't want
// another thread to add to the wrapper while we are updating wrapper's current set of handlers.
NamedHttpClientHandlerWrapper wrapper = request.RequestHandler;
// The lock will prevent new handlers from being added in the HttpEngineFactory.AddNamedClientHandler() method above.
lock (wrapper)
{
// By this point, it is an error if we do not have access to the HttpClientHandler associated with the named client.
// Because we clear the wrapper at the end of this code block, wrapper may be empty if we had previously
// configured the named HttpClientHandler already. The IsAlwaysEmpty property gets around this issue.
if (wrapper.IsAlwaysEmpty)
{
throw new InvalidOperationException(string.Format(
"HttpClientHandler for the named client '{0}' has not been registered with MiniRestSharp. Did you forget to call RestSharpServiceCollectionExtensions.AddRestSharpClient(IServiceCollection, string)?",
wrapper.Name));
}
// I've confirmed that the only place the wrapped HttpClientHandlers are configured is in this method.
NetStd20HttpRequest returnValue = base.ConfigureWebRequest(request);
// Now that the wrapped HttpClientHandlers are configured, we remove them from the wrapper
// since we can't configure them again anyway. It's of course possible that these handlers
// get recycled by IHttpClientFactory and become configurable again. When this happens I think the
// RestSharpServiceCollectionExtensions system will end up calling HttpEngineFactory.AddNamedClientHandler()
// again, which will result in it being added to wrapper again for another round of configuration later.
wrapper.Clear();
return(returnValue);
}
}
private async Task <HttpResponse> PostPutInternal(string method)
{
NetStd20HttpRequest request = this.CreateWebRequest(method, this.Url);
this.ConfigureWebRequest(request);
this.PreparePostBody(request.RequestMessage);
this.WriteRequestBody(request);
return(await this.GetResponse(request));
}
private async Task <HttpResponse> GetStyleMethodInternal(string method)
{
NetStd20HttpRequest request = this.CreateWebRequest(method, this.Url);
this.ConfigureWebRequest(request);
if (this.HasBody && (method == "DELETE" || method == "OPTIONS"))
{
request.RequestMessage.Content.Headers.ContentType = MediaTypeHeaderValue.Parse(this.RequestContentType);
this.WriteRequestBody(request);
}
return(await this.GetResponse(request));
}
protected virtual NetStd20HttpRequest ConfigureWebRequest(NetStd20HttpRequest request)
{
////////// 1. Configure HttpRequestMessage.
this.AppendHeaders(request.RequestMessage);
// Override certain headers that are controlled by RestSharp.
request.RequestMessage.Headers.TE.Clear();
request.RequestMessage.Headers.TE.Add(new TransferCodingWithQualityHeaderValue("deflate"));
request.RequestMessage.Headers.TE.Add(new TransferCodingWithQualityHeaderValue("gzip"));
request.RequestMessage.Headers.TE.Add(new TransferCodingWithQualityHeaderValue("identity"));
if (this.UserAgent.HasValue())
{
request.RequestMessage.Headers.UserAgent.Add(ProductInfoHeaderValue.Parse(this.UserAgent));
}
////////// 2. Configure HttpClientHandler
this.AppendCookies(request.RequestHandler, request.RequestMessage.RequestUri);
// This matches with request.Headers.TE header.
request.RequestHandler.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip | DecompressionMethods.None;
// Handler credentials.
request.RequestHandler.UseDefaultCredentials = this.UseDefaultCredentials;
if (this.Credentials != null)
{
request.RequestHandler.Credentials = this.Credentials;
}
// redirects
request.RequestHandler.AllowAutoRedirect = this.FollowRedirects;
if (this.FollowRedirects && this.MaxRedirects.HasValue)
{
request.RequestHandler.MaxAutomaticRedirections = this.MaxRedirects.Value;
}
////////// 3. Configure HttpClient
if (this.Timeout != 0)
{
request.RequestClient.Timeout = TimeSpan.FromMilliseconds(this.Timeout);
}
return(request);
}
private async Task <HttpResponse> GetResponse(NetStd20HttpRequest request)
{
HttpResponse response = new HttpResponse {
ResponseStatus = ResponseStatus.None
};
try
{
NetStd20HttpResponse webResponse = await GetRawResponse(request);
this.ExtractResponseData(response, webResponse);
}
catch (Exception ex)
{
this.ExtractErrorResponse(response, ex);
}
return(response);
}
private void WriteRequestBody(NetStd20HttpRequest webRequest)
{
if (this.HasBody || this.HasFiles || this.AlwaysMultipartFormData)
{
webRequest.RequestMessage.Content.Headers.ContentLength = this.CalculateContentLength();
}
using (Stream requestStream = webRequest.GetRequestStreamAsync())
{
if (this.HasFiles || this.AlwaysMultipartFormData)
{
this.WriteMultipartFormData(requestStream);
}
else if (this.RequestBodyBytes != null)
{
requestStream.Write(this.RequestBodyBytes, 0, this.RequestBodyBytes.Length);
}
else if (this.RequestBody != null)
{
this.WriteStringTo(requestStream, this.RequestBody);
}
}
}
private static async Task <NetStd20HttpResponse> GetRawResponse(NetStd20HttpRequest request)
{
try
{
// Some methods do not allow entity-body in request, so we must remove the HttpContent.
// See https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods for which method allows/disallows entity-body.
// We need to do this because in the constructor of NetStd20HttpRequest, we always set a HttpContent to make
// programming easier. In netstandard2.0, the framework does not allow HttpContent for methods such as GET.
HttpMethod requestMethod = request.RequestMessage.Method;
if (requestMethod == HttpMethod.Delete ||
requestMethod == HttpMethod.Get ||
requestMethod == HttpMethod.Head ||
requestMethod == HttpMethod.Options)
{
// Will also remove any HttpContent-specific headers that may have been set erroneously.
request.RequestMessage.Content = null;
}
return(await request.GetResponseAsync());
}
catch (WebException ex)
{
// Check to see if this is an HTTP error or a transport error.
// In cases where an HTTP error occurs ( status code >= 400 )
// return the underlying HTTP response, otherwise assume a
// transport exception (ex: connection timeout) and
// rethrow the exception
var exResponse = ex.Response as NetStd20HttpResponse;
if (exResponse != null)
{
return(exResponse);
}
throw;
}
}
