libhttpserver/examples/minimal_deferred.cpp at master · etr/libhttpserver · GitHub

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This file is part of libhttpserver

This library is free software; you can redistribute it and/or

modify it under the terms of the GNU Lesser General Public

License as published by the Free Software Foundation; either

version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public

License along with this library; if not, write to the Free Software

Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301

USA

// minimal_deferred.cpp - serve a response body in chunks using a deferred

// callback lambda. The lambda is called repeatedly by libmicrohttpd until it

// returns -1 (signalling end-of-body). The `done` flag ensures the body is

// sent exactly once; the second call returns -1 to close the stream.

#include <algorithm>

#include <cstdint>

#include <cstring>

#include <string>

#include <httpserver.hpp>

int main() {

httpserver::webserver ws{httpserver::create_webserver(8080)};

ws.on_get("/hello", [](const httpserver::http_request&) {

return httpserver::http_response::deferred(

[body = std::string("hello from deferred"),

done = false](std::uint64_t, char* buf,

std::size_t max) mutable -> ssize_t {

if (done) return -1;

done = true;

std::size_t n = std::min(body.size(), max);

std::memcpy(buf, body.data(), n);

return static_cast<ssize_t>(n);

});

ws.start(true);

return 0;

}

libhttpserver/examples/minimal_deferred.cpp at master · etr/libhttpserver · GitHub

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