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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

// args_processing.cpp - demonstrates get_args() and get_args_flat() to

// process all query string and body arguments from an HTTP request.

// Try these URLs:

// http://localhost:8080/args?name=john&age=30

// http://localhost:8080/args?id=1&id=2&id=3 (multiple values for same key)

// http://localhost:8080/args?colors=red&colors=green&colors=blue

#include <iostream>

#include <sstream>

#include <string>

#include <string_view>

#include <httpserver.hpp>

int main() {

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

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

std::ostringstream response_body;

response_body << "=== Using get_args() (supports multiple values per key) ===\n\n";

// get_args() returns a const reference to a map where each key

// maps to an http_arg_value. http_arg_value contains a vector of

// values for parameters like "?id=1&id=2&id=3". The reference

// remains valid for the duration of this handler call.

const auto& args = req.get_args();

for (const auto& [key, arg_value] : args) {

response_body << "Key: " << key << "\n";

// Use get_all_values() to get all values for this key

auto all_values = arg_value.get_all_values();

if (all_values.size() > 1) {

response_body << " Values (" << all_values.size() << "):\n";

for (const auto& v : all_values) {

response_body << " - " << v << "\n";

}

} else {

// For single values, http_arg_value converts to string_view

response_body << " Value: " << std::string_view(arg_value) << "\n";

}

response_body << "\n=== Using get_args_flat() (one value per key) ===\n\n";

// get_args_flat() returns a simple map with one value per key.

// If a key has multiple values, only the first value is returned.

auto args_flat = req.get_args_flat();

for (const auto& [key, value] : args_flat) {

response_body << key << " = " << value << "\n";

}

response_body << "\n=== Accessing individual arguments ===\n\n";

// You can also access individual arguments directly

auto name = req.get_arg("name"); // Returns http_arg_value (may have multiple values)

auto name_flat = req.get_arg_flat("name"); // Returns string_view (first value only)

if (!name.get_flat_value().empty()) {

response_body << "name (via get_arg): " << std::string_view(name) << "\n";

}

if (!name_flat.empty()) {

response_body << "name (via get_arg_flat): " << name_flat << "\n";

}

return httpserver::http_response::string(response_body.str());

});

std::cout << "Server running on http://localhost:8080/args\n";

std::cout << "Try: http://localhost:8080/args?name=john&age=30\n";

std::cout << "Or: http://localhost:8080/args?id=1&id=2&id=3\n";

ws.start(true);

return 0;

}