boost::asio, synchronous HTTP read on sslstream

Torsten Mueller <>
Sat, 22 Jun 2013 13:48:20 +0200
I have a problem reading on a sslstream. If the content-length is
specified it works fine, I read exactly the given length and have a
complet answer. If I didn't get a content-length header from the server
I use an algorithm like this:

    asio::ssl::stream<asio::ip::tcp::socket&>* m_pSslStream;

    // ... initializations ...

    // ... read HTTP headers ...
    // (get no content-length here)

    // read the HTTP body
    asio::streambuf sb;
    system::error_code error;
    size_t n;
    while ((n = asio::read(*m_pSslStream, sb,
                             asio::transfer_exactly(1024), error)) > 0)
        // ... handle contents ...

This should read 1k-blocks until there are no more bytes in the stream.
The last call to the read-function should return less than 1024 bytes
and an error code. Indeed this happens, exactly as specified, but the
last call to the read-function doesn't return before a long timeout is
reached, about one minute or more. What's the reason for this?

I tried also other things: transfer_at_least() or transfer_all(), also
the read_some-method of the sslstream class. All show exactly the same

What can I do to avoid this timeout at the end? Is this related to SSL?
I can't remember that I had problems with this on non-SSL streams.


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