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Created attachment 2640 [details]
Example demonstrating the hang.
When using HttpClient, in order to push data over the network you have to implement HttpContent and overload SerializeToStreamAsync. Inside the overload, if a StreamWriter is used and it is just flushed, everything works correctly. However, if the StreamWriter is disposed, even if it's set to leave the underlying stream open, the call never finishes. strace shows a connect() call and then a hang on wait (never send()s the data). Both of them work in MS.NET 4.5.
This doesn't work, but it should:
using (StreamWriter writer = new StreamWriter(stream, new UTF8Encoding(false), 4096, true))
This works, but doesn't close the StreamWriter:
StreamWriter writer = new StreamWriter(stream);
Compiling the attached example is simple:
mcs -r:System.Net.Http Program.cs
The error happens when compiling both with mcs and Visual Studio 2012.
Fixed in master