Hello,

> Would you mind sharing your code (perhaps in a git repo) so that I can reproduce, debug and advise?

No problem, the code is just a slightly modified version of the example:

// Distributed under the Boost Software License, Version 1.0. (See accompanying

// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// Official repository: https://github.com/boostorg/beast

//------------------------------------------------------------------------------

// Example: HTTP server, asynchronous

//------------------------------------------------------------------------------

#include <boost/beast/core.hpp>

#include <boost/beast/http.hpp>

#include <boost/beast/version.hpp>

#include <boost/asio/dispatch.hpp>

#include <boost/asio/strand.hpp>

#include <boost/asio/buffers_iterator.hpp>

#include <boost/config.hpp>

#include <algorithm>

#include <cstdlib>

#include <functional>

#include <iostream>

#include <memory>

#include <string>

#include <thread>

#include <vector>

namespace beast = boost::beast; // from <boost/beast.hpp>

namespace http = beast::http; // from <boost/beast/http.hpp>

namespace net = boost::asio; // from <boost/asio.hpp>

using tcp = boost::asio::ip::tcp; // from <boost/asio/ip/tcp.hpp>

// Return a reasonable mime type based on the extension of a file.

beast::string_view

mime_type(beast::string_view path)

{

using beast::iequals;

auto const ext = [&path]

{

auto const pos = path.rfind(".");

if(pos == beast::string_view::npos)

return beast::string_view{};

return path.substr(pos);

}();

if(iequals(ext, ".htm")) return "text/html";

if(iequals(ext, ".html")) return "text/html";

if(iequals(ext, ".php")) return "text/html";

if(iequals(ext, ".css")) return "text/css";

if(iequals(ext, ".txt")) return "text/plain";

if(iequals(ext, ".js")) return "application/javascript";

if(iequals(ext, ".json")) return "application/json";

if(iequals(ext, ".xml")) return "application/xml";

if(iequals(ext, ".swf")) return "application/x-shockwave-flash";

if(iequals(ext, ".flv")) return "video/x-flv";

if(iequals(ext, ".png")) return "image/png";

if(iequals(ext, ".jpe")) return "image/jpeg";

if(iequals(ext, ".jpeg")) return "image/jpeg";

if(iequals(ext, ".jpg")) return "image/jpeg";

if(iequals(ext, ".gif")) return "image/gif";

if(iequals(ext, ".bmp")) return "image/bmp";

if(iequals(ext, ".ico")) return "image/vnd.microsoft.icon";

if(iequals(ext, ".tiff")) return "image/tiff";

if(iequals(ext, ".tif")) return "image/tiff";

if(iequals(ext, ".svg")) return "image/svg+xml";

if(iequals(ext, ".svgz")) return "image/svg+xml";

return "application/text";

}

// Append an HTTP rel-path to a local filesystem path.

// The returned path is normalized for the platform.

std::string

path_cat(

beast::string_view base,

beast::string_view path)

{

if(base.empty())

return std::string(path);

std::string result(base);

#ifdef BOOST_MSVC

char constexpr path_separator = '\\';

if(result.back() == path_separator)

result.resize(result.size() - 1);

result.append(path.data(), path.size());

for(auto& c : result)

if(c == '/')

c = path_separator;

#else

char constexpr path_separator = '/';

if(result.back() == path_separator)

result.resize(result.size() - 1);

result.append(path.data(), path.size());

#endif

return result;

}

// This function produces an HTTP response for the given

// request. The type of the response object depends on the

// contents of the request, so the interface requires the

// caller to pass a generic lambda for receiving the response.

template<

class Body, class Allocator,

class Send>

void

handle_request(

beast::string_view doc_root,

http::request<Body, http::basic_fields<Allocator>>&& req,

Send&& send)

{

// Returns a bad request response

auto const bad_request =

[&req](beast::string_view why)

{

http::response<http::string_body> res{http::status::bad_request, req.version()};

res.set(http::field::server, BOOST_BEAST_VERSION_STRING);

res.set(http::field::content_type, "text/html");

res.keep_alive(req.keep_alive());

res.body() = std::string(why);

res.prepare_payload();

return res;

};

// Returns a not found response

auto const not_found =

[&req](beast::string_view target)

{

http::response<http::string_body> res{http::status::not_found, req.version()};

res.set(http::field::server, BOOST_BEAST_VERSION_STRING);

res.set(http::field::content_type, "text/html");

res.keep_alive(req.keep_alive());

res.body() = "The resource '" + std::string(target) + "' was not found.";

res.prepare_payload();

return res;

};

// Returns a server error response

auto const server_error =

[&req](beast::string_view what)

{

http::response<http::string_body> res{http::status::internal_server_error, req.version()};

res.set(http::field::server, BOOST_BEAST_VERSION_STRING);

res.set(http::field::content_type, "text/html");

res.keep_alive(req.keep_alive());

res.body() = "An error occurred: '" + std::string(what) + "'";

res.prepare_payload();

return res;

};

if (req.method() == http::verb::post && req.target()=="/xxx" )

{

for (const auto &h:req)

printf("heder: %s=%s\n", std::string(h.name_string()).c_str(), std::string(h.value()).c_str());

printf("body as string:\n");

std::string body{ boost::asio::buffers_begin(req.body().data()),

boost::asio::buffers_end(req.body().data()) };

printf("%s", body.c_str());

printf("end of body as string\n");

printf("body with iterator:\n");

const auto begin = boost::asio::buffers_begin(req.body().data());

const auto end = boost::asio::buffers_end(req.body().data());

unsigned x=0;

for (auto it = begin; it != end; it++)

putchar(*it);

printf("end of body with iterator\n");

}

// Make sure we can handle the method

if( req.method() != http::verb::get &&

req.method() != http::verb::head)

return send(bad_request("Unknown HTTP-method"));

// Request path must be absolute and not contain "..".

if( req.target().empty() ||

req.target()[0] != '/' ||

req.target().find("..") != beast::string_view::npos)

return send(bad_request("Illegal request-target"));

// Build the path to the requested file

std::string path = path_cat(doc_root, req.target());

if(req.target().back() == '/')

path.append("index.html");

// Attempt to open the file

beast::error_code ec;

http::file_body::value_type body;

body.open(path.c_str(), beast::file_mode::scan, ec);

// Handle the case where the file doesn't exist

if(ec == beast::errc::no_such_file_or_directory)

return send(not_found(req.target()));

// Handle an unknown error

if(ec)

return send(server_error(ec.message()));

// Cache the size since we need it after the move

auto const size = body.size();

// Respond to HEAD request

if(req.method() == http::verb::head)

{

http::response<http::empty_body> res{http::status::ok, req.version()};

res.set(http::field::server, BOOST_BEAST_VERSION_STRING);

res.set(http::field::content_type, mime_type(path));

res.content_length(size);

res.keep_alive(req.keep_alive());

return send(std::move(res));

}

// Respond to GET request

http::response<http::file_body> res{

std::piecewise_construct,

std::make_tuple(std::move(body)),

std::make_tuple(http::status::ok, req.version())};

res.set(http::field::server, BOOST_BEAST_VERSION_STRING);

res.set(http::field::content_type, mime_type(path));

res.content_length(size);

res.keep_alive(req.keep_alive());

return send(std::move(res));

}

//------------------------------------------------------------------------------

// Report a failure

void

fail(beast::error_code ec, char const* what)

{

std::cerr << what << ": " << ec.message() << "\n";

}

// Handles an HTTP server connection

class session : public std::enable_shared_from_this<session>

{

// This is the C++11 equivalent of a generic lambda.

// The function object is used to send an HTTP message.

struct send_lambda

{

session& self_;

explicit

send_lambda(session& self)

: self_(self)

{

}

template<bool isRequest, class Body, class Fields>

void

operator()(http::message<isRequest, Body, Fields>&& msg) const

{

// The lifetime of the message has to extend

// for the duration of the async operation so

// we use a shared_ptr to manage it.

auto sp = std::make_shared<

http::message<isRequest, Body, Fields>>(std::move(msg));

// Store a type-erased version of the shared

// pointer in the class to keep it alive.

self_.res_ = sp;

// Write the response

http::async_write(

self_.stream_,

*sp,

beast::bind_front_handler(

&session::on_write,

self_.shared_from_this(),

sp->need_eof()));

}

};

beast::tcp_stream stream_;

beast::flat_buffer buffer_;

std::shared_ptr<std::string const> doc_root_;

// http::request<http::string_body> req_;

http::request<http::dynamic_body> req_;

std::shared_ptr<void> res_;

send_lambda lambda_;

public:

// Take ownership of the stream

session(

tcp::socket&& socket,

std::shared_ptr<std::string const> const& doc_root)

: stream_(std::move(socket))

, doc_root_(doc_root)

, lambda_(*this)

{

}

// Start the asynchronous operation

void

run()

{

// We need to be executing within a strand to perform async operations

// on the I/O objects in this session. Although not strictly necessary

// for single-threaded contexts, this example code is written to be

// thread-safe by default.

net::dispatch(stream_.get_executor(),

beast::bind_front_handler(

&session::do_read,

shared_from_this()));

}

void

do_read()

{

// Make the request empty before reading,

// otherwise the operation behavior is undefined.

req_ = {};

// Set the timeout.

stream_.expires_after(std::chrono::seconds(30));

// Read a request

http::async_read(stream_, buffer_, req_,

beast::bind_front_handler(

&session::on_read,

shared_from_this()));

}

void

on_read(

beast::error_code ec,

std::size_t bytes_transferred)

{

boost::ignore_unused(bytes_transferred);

// This means they closed the connection

if(ec == http::error::end_of_stream)

return do_close();

if(ec)

return fail(ec, "read");

// Send the response

handle_request(*doc_root_, std::move(req_), lambda_);

}

void

on_write(

bool close,

beast::error_code ec,

std::size_t bytes_transferred)

{

boost::ignore_unused(bytes_transferred);

if(ec)

return fail(ec, "write");

if(close)

{

// This means we should close the connection, usually because

// the response indicated the "Connection: close" semantic.

return do_close();

}

// We're done with the response so delete it

res_ = nullptr;

// Read another request

do_read();

}

void

do_close()

{

// Send a TCP shutdown

beast::error_code ec;

stream_.socket().shutdown(tcp::socket::shutdown_send, ec);

// At this point the connection is closed gracefully

}

};

//------------------------------------------------------------------------------

// Accepts incoming connections and launches the sessions

class listener : public std::enable_shared_from_this<listener>

{

net::io_context& ioc_;

tcp::acceptor acceptor_;

std::shared_ptr<std::string const> doc_root_;

public:

listener(

net::io_context& ioc,

tcp::endpoint endpoint,

std::shared_ptr<std::string const> const& doc_root)

: ioc_(ioc)

, acceptor_(net::make_strand(ioc))

, doc_root_(doc_root)

{

beast::error_code ec;

// Open the acceptor

acceptor_.open(endpoint.protocol(), ec);

if(ec)

{

fail(ec, "open");

return;

}

// Allow address reuse

acceptor_.set_option(net::socket_base::reuse_address(true), ec);

if(ec)

{

fail(ec, "set_option");

return;

}

// Bind to the server address

acceptor_.bind(endpoint, ec);

if(ec)

{

fail(ec, "bind");

return;

}

// Start listening for connections

acceptor_.listen(

net::socket_base::max_listen_connections, ec);

if(ec)

{

fail(ec, "listen");

return;

}

// Start accepting incoming connections

void

run()

{

do_accept();

}

private:

void

do_accept()

{

// The new connection gets its own strand

acceptor_.async_accept(

net::make_strand(ioc_),

beast::bind_front_handler(

&listener::on_accept,

shared_from_this()));

}

void

on_accept(beast::error_code ec, tcp::socket socket)

{

if(ec)

{

fail(ec, "accept");

}

else

{

// Create the session and run it

std::make_shared<session>(

std::move(socket),

doc_root_)->run();

}

// Accept another connection

do_accept();

}

};

//------------------------------------------------------------------------------

int main(int argc, char* argv[])

{

// Check command line arguments.

if (argc != 4)

{

std::cerr <<

"Usage: http-server-async <address> <port> <doc_root>\n" <<

"Example:\n" <<

" http-server-async 0.0.0.0 8080 .\n";

return EXIT_FAILURE;

}

auto const address = net::ip::make_address(argv[1]);

auto const port = static_cast<unsigned short>(std::atoi(argv[2]));

auto const doc_root = std::make_shared<std::string>(argv[3]);

// The io_context is required for all I/O

net::io_context ioc;

// Create and launch a listening port

std::make_shared<listener>(

ioc,

tcp::endpoint{address, port},

doc_root)->run();

// Run the I/O service

printf("running\n");

ioc.run();

return EXIT_SUCCESS;

}

And this is my index.html:

<?xml version="1.0" encoding="utf-8"?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd>

<body>

<label for="field0">field 0:</label><input type="text" id="field0" name="field0"/><br/><br/>

<label for="field1">field 1:</label><input type="password" id="field1" name="field1"/><br/><br/>

<label for="field2">field 2:</label><input type="text" id="field2" name="field2"/><br/><br/>

<label for="field3">field 3:</label><input type="text" id="field3" name="field3"/><br/><br/>

<label for="field4">field 4:</label><input type="file" id="field4" name="field4"/><br/><br/>

</form>

</body>

</html>

Klebsch Mario
Funktion | R&D

Tel: +49 (0) 531 38 701 718
Raum: Braunschweig, E20

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