Re: [boost] [beast] Chunking example

On Sun, Jul 2, 2017 at 5:41 AM, Bjorn Reese via Boost wrote:

How would an example of receiving a chunked transfer using the synchronous API look? In pseudo-code, I want to do as follows:

establish connection while not closed read chunk print chunk

That's going to be be quite involved, you would need to subclass beast::http::basic_parser and implement on_chunk to remember the chunk size. It is not something that I recommend nor is it a common use-case. HTTP applications are not supposed to care about the boundaries between chunks since intermediates like proxies are allowed to re-frame chunked message payloads. However, some applications may wish to decode the chunk-extension and Beast handles that, but you have to subclass beast::http::basic_parser for it. Its possible that what you are really asking is how to read a message payload incrementally? One of the examples performs a similar operation: http://vinniefalco.github.io/beast/beast/more_examples/http_relay.html Something like this should achieve your goal (note, untested): /* This function reads a message using a fixed size buffer to hold portions of the body, and prints the body contents to a `std::ostream`. */ template< bool isRequest, class SyncReadStream, class DynamicBuffer> void read_and_print_body( std::ostream& os, SyncReadStream& stream, DynamicBuffer& buffer, error_code& ec) { parser p; read_header(stream, buffer, p, ec); if(ec) return; while(! p.is_done()) { char buf[512]; p.get().body.data = buf; p.get().body.size = sizeof(buf); read(stream, buffer, p, ec); if(ec == error::need_buffer) ec.assign(0, ec.category()); if(ec) return; os.write(buf, sizeof(buf) - p.get().body.size); } } Thanks