Exception from handle_write_large_body  #19

Migrated from Codeplex: https://casablanca.codeplex.com/discussions/647518

niamurph wrote:

I am using cpprestsdk 2.6 and getting an exception with the description "Unexpected end of request body stream encountered before Content-Length satisfied.". It is thrown from the function handle_write_large_body. My suspicion is that there may be a concurrency issue in the web::http::client::http_client ( or maybe I am using it wrong).

Hitting the exception means that my request never gets sent.

I am running on Mac OS X 10.10.
By adding some logging statements I can see a buffer (boost::asio::buffer) of 90 bytes being written and then read. Usually a single read and a single write. But occasionally there is a second read, and since the buffer is already read, it retuns 0 leading to the path that hits the exception. The exception message says the size is wrong, but I think some concurrency issue has led to the buffer being read one more time after it has already finished.

I think it may be a concurrency issue, since I can avoid it by using a new connection for every message I send. If I reuse a web::http::client::http_client for multiple messages to the same server, then I hit this issue. Maybe I need to check that there are no messages still being processed for the http_client before I queue up another message to the same client, but I do not know how to do that.

Are there any known issues like this. My workaround for the moment is to create a new web::http::client::http_client for every message. That is probably not as good for performance. I can live with the workaround, but I would be keen to find the root cause.