[Boost-bugs] [Boost C++ Libraries] #12875: ip::tcp::iostream flush() doesn't clear the buffer. Neither does clear();

Subject: [Boost-bugs] [Boost C++ Libraries] #12875: ip::tcp::iostream flush() doesn't clear the buffer. Neither does clear();
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2017-02-28 17:27:02

#12875: ip::tcp::iostream flush() doesn't clear the buffer.  Neither does clear();
---------------------------+--------------------------------------
 Reporter:  ericrsoldan@…  |       Type:  Bugs
   Status:  new            |  Milestone:  To Be Determined
Component:  None           |    Version:  Boost 1.63.0
 Severity:  Problem        |   Keywords:  tcp iostream flush clear
---------------------------+--------------------------------------
 Code something like the below shows the issue:

 std::string postData = "This is my post data.";

 ip::tcp::iostream stream;

 stream.expires_from_now(boost::posix_time::seconds(10));

 stream.connect("192.168.1.128", "http");

 stream << "POST /myRestfulPath HTTP/1.1\r\n";

 stream << "Content-Type: application/x-www-form-urlencoded\r\n";

 stream << "Host: 192.168.1.128:8080\r\n";

 stream << "Content-Length: " << postData.size() << "\r\n";

 stream << "Connection: Close\r\n\r\n";

 stream.flush();

 stream << postData.c_str();

 stream.flush();


 Using Wireshark, the headers show up with the first flush,
 but also show up from the second, with the postData appended.

 I understand that I do not need the first flush in this example.
 However, the server requires an "Expect: 100-Continue" so
 therefore I need to send before the postData, and then receive
 the "Continue", and then send the postData.  (Not shown.)

 stream.clear() doesn't clear what flush left behind, either.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/12875>
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