I'm trying to clone a request using the method outlined in this answer: https://stackoverflow.com/a/18014515/406322
However, I get an ObjectDisposedException, if the original request has content.
How can you reliably clone a HttpRequestMessage?
The HttpRequestMessage class contains headers, the HTTP verb, and potentially data. An HttpRequestMessage instance should not be modified and/or reused after being sent.
C# HttpClient HEAD request var url = "http://webcode.me"; using var client = new HttpClient(); var result = await client. SendAsync(new HttpRequestMessage(HttpMethod. Head, url)); Console. WriteLine(result);
This should do the trick:
public static async Task<HttpRequestMessage> CloneHttpRequestMessageAsync(HttpRequestMessage req) { HttpRequestMessage clone = new HttpRequestMessage(req.Method, req.RequestUri); // Copy the request's content (via a MemoryStream) into the cloned object var ms = new MemoryStream(); if (req.Content != null) { await req.Content.CopyToAsync(ms).ConfigureAwait(false); ms.Position = 0; clone.Content = new StreamContent(ms); // Copy the content headers if (req.Content.Headers != null) foreach (var h in req.Content.Headers) clone.Content.Headers.Add(h.Key, h.Value); } clone.Version = req.Version; foreach (KeyValuePair<string, object> prop in req.Properties) clone.Properties.Add(prop); foreach (KeyValuePair<string, IEnumerable<string>> header in req.Headers) clone.Headers.TryAddWithoutValidation(header.Key, header.Value); return clone; }
If you call LoadIntoBufferAsync on the content, you can guarantee that the content is buffered inside the HttpContent object. The only problem remaining is that reading the stream does not reset the position, so you need to ReadAsStreamAsync and set the stream Position = 0.
My example is very similar to the one Carlos showed...
private async Task<HttpResponseMessage> CloneResponseAsync(HttpResponseMessage response) { var newResponse = new HttpResponseMessage(response.StatusCode); var ms = new MemoryStream(); foreach (var v in response.Headers) newResponse.Headers.TryAddWithoutValidation(v.Key, v.Value); if (response.Content != null) { await response.Content.CopyToAsync(ms).ConfigureAwait(false); ms.Position = 0; newResponse.Content = new StreamContent(ms); foreach (var v in response.Content.Headers) newResponse.Content.Headers.TryAddWithoutValidation(v.Key, v.Value); } return newResponse; }
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