sample/query_string_params/main.cpp

#include <iostream>

#include <restinio/core.hpp>

#include <iterator>

// Create request handler.
restinio::request_handling_status_t handler( const restinio::request_handle_t& req )
{
    if( restinio::http_method_get() == req->header().method() )
    {
        fmt::basic_memory_buffer< char, 1u > response_body;
        auto response_body_inserter = std::back_inserter( response_body );

        fmt::format_to( response_body_inserter,
                RESTINIO_FMT_FORMAT_STRING( "GET request to '{}'\n" ),
                req->header().request_target() );

        // Request header fields.
        fmt::format_to( response_body_inserter,
                RESTINIO_FMT_FORMAT_STRING( "HTTP-fields ({}):\n" ),
                req->header().fields_count() );
        for( const auto & f : req->header() )
        {
            fmt::format_to( response_body_inserter,
                    RESTINIO_FMT_FORMAT_STRING( "{}: {}\n" ),
                    f.name(), f.value() );
        }

        // Query params.
        const auto qp = restinio::parse_query( req->header().query() );

        if( qp.empty() )
        {
            fmt::format_to( response_body_inserter,
                    RESTINIO_FMT_FORMAT_STRING( "No query parameters." ) );
        }
        else
        {
            fmt::format_to( response_body_inserter,
                    RESTINIO_FMT_FORMAT_STRING( "Query params ({}):\n" ), qp.size() );

            for( const auto & p : qp )
            {
                fmt::format_to( response_body_inserter,
                        RESTINIO_FMT_FORMAT_STRING( "'{}' => '{}'\n" ),
                        restinio::fmtlib_tools::streamed( p.first ),
                        restinio::fmtlib_tools::streamed( p.second ) );
            }
        }

        if( qp.has( "debug" ) && qp[ "debug" ] == "true" )
        {
            std::cout.write( response_body.data(), response_body.size() );
            std::cout << std::flush;
        }

        req->create_response()
            .append_header( restinio::http_field::server, "RESTinio query string params server" )
            .append_header_date_field()
            .append_header( restinio::http_field::content_type, "text/plain; charset=utf-8" )
            .set_body( std::move(response_body) )
            .done();

        return restinio::request_accepted();
    }

    return restinio::request_rejected();
}

int main()
{
    try
    {
        restinio::run(
            restinio::on_thread_pool( std::thread::hardware_concurrency() )
                .port( 8080 )
                .address( "localhost" )
                .request_handler( handler ) );
    }
    catch( const std::exception & ex )
    {
        std::cerr << "Error: " << ex.what() << std::endl;
        return 1;
    }

    return 0;
}