// HTTP-server at port 8080 using 1 thread

// Unless you do more heavy non-threaded processing in the resources,

// 1 thread is usually faster than several threads

HttpServer server;

server.config.port = 8080;

// Add resources using path-regex and method-string, and an anonymous function

// POST-example for the path /string, responds the posted string

server.resource["^/string$"]["POST"] = [](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {

// Retrieve string:

auto content = request->content.string();

// request->content.string() is a convenience function for:

// stringstream ss;

// ss << request->content.rdbuf();

// auto content=ss.str();

*response << "HTTP/1.1 200 OK\r\nContent-Length: " << content.length() << "\r\n\r\n"

<< content;

// Alternatively, use one of the convenience functions, for instance:

// response->write(content);

};

// POST-example for the path /json, responds firstName+" "+lastName from the posted json

// Responds with an appropriate error message if the posted json is not valid, or if firstName or lastName is missing

// Example posted json:

// {

// "firstName": "John",

// "lastName": "Smith",

// "age": 25

// }

server.resource["^/json$"]["POST"] = [](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {

try {

ptree pt;

read_json(request->content, pt);

auto name = pt.get<string>("firstName") + " " + pt.get<string>("lastName");

*response << "HTTP/1.1 200 OK\r\n"

<< "Content-Length: " << name.length() << "\r\n\r\n"

<< name;

}

catch(const exception &e) {

*response << "HTTP/1.1 400 Bad Request\r\nContent-Length: " << strlen(e.what()) << "\r\n\r\n"

<< e.what();

}

// Alternatively, using a convenience function:

// try {

// ptree pt;

// read_json(request->content, pt);

// auto name=pt.get<string>("firstName")+" "+pt.get<string>("lastName");

// response->write(name);

// }

// catch(const exception &e) {

// response->write(SimpleWeb::StatusCode::client_error_bad_request, e.what());

// }

};

// GET-example for the path /info

// Responds with request-information

server.resource["^/info$"]["GET"] = [](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {

stringstream stream;

stream << "<h1>Request from " << request->remote_endpoint().address().to_string() << ":" << request->remote_endpoint().port() << "</h1>";

stream << request->method << " " << request->path << " HTTP/" << request->http_version;

stream << "<h2>Query Fields</h2>";

auto query_fields = request->parse_query_string();

for(auto &field : query_fields)

stream << field.first << ": " << field.second << "<br>";

stream << "<h2>Header Fields</h2>";

for(auto &field : request->header)

stream << field.first << ": " << field.second << "<br>";

response->write(stream);

};

// GET-example for the path /match/[number], responds with the matched string in path (number)

// For instance a request GET /match/123 will receive: 123

server.resource["^/match/([0-9]+)$"]["GET"] = [](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {

response->write(request->path_match[1].str());

};

// GET-example simulating heavy work in a separate thread

server.resource["^/work$"]["GET"] = [](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> /*request*/) {

thread work_thread([response] {

this_thread::sleep_for(chrono::seconds(5));

response->write("Work done");

});

work_thread.detach();

};

// Default GET-example. If no other matches, this anonymous function will be called.

// Will respond with content in the web/-directory, and its subdirectories.

// Default file: index.html

// Can for instance be used to retrieve an HTML 5 client that uses REST-resources on this server

server.default_resource["GET"] = [](shared_ptr<HttpServer::Response> response, shared_ptr<HttpServer::Request> request) {

try {

auto web_root_path = boost::filesystem::canonical("web");

auto path = boost::filesystem::canonical(web_root_path / request->path);

// Check if path is within web_root_path

if(distance(web_root_path.begin(), web_root_path.end()) > distance(path.begin(), path.end()) ||

!equal(web_root_path.begin(), web_root_path.end(), path.begin()))

throw invalid_argument("path must be within root path");

if(boost::filesystem::is_directory(path))

path /= "index.html";

SimpleWeb::CaseInsensitiveMultimap header;

// Uncomment the following line to enable Cache-Control

// header.emplace("Cache-Control", "max-age=86400");

#ifdef HAVE_OPENSSL

#endif

auto ifs = make_shared<ifstream>();

ifs->open(path.string(), ifstream::in | ios::binary | ios::ate);

if(*ifs) {

auto length = ifs->tellg();

ifs->seekg(0, ios::beg);

header.emplace("Content-Length", to_string(length));

response->write(header);

// Trick to define a recursive function within this scope (for example purposes)

class FileServer {

public:

static void read_and_send(const shared_ptr<HttpServer::Response> &response, const shared_ptr<ifstream> &ifs) {

// Read and send 128 KB at a time

static vector<char> buffer(131072); // Safe when server is running on one thread

streamsize read_length;

if((read_length = ifs->read(&buffer[0], static_cast<streamsize>(buffer.size())).gcount()) > 0) {

response->write(&buffer[0], read_length);

if(read_length == static_cast<streamsize>(buffer.size())) {

response->send([response, ifs](const SimpleWeb::error_code &ec) {

if(!ec)

read_and_send(response, ifs);

else

cerr << "Connection interrupted" << endl;

});

}

}

}

};

FileServer::read_and_send(response, ifs);

}

else

throw invalid_argument("could not read file");

}

catch(const exception &e) {

response->write(SimpleWeb::StatusCode::client_error_bad_request, "Could not open path " + request->path + ": " + e.what());

}

};

server.on_error = [](shared_ptr<HttpServer::Request> /*request*/, const SimpleWeb::error_code & /*ec*/) {

// Handle errors here

// Note that connection timeouts will also call this handle with ec set to SimpleWeb::errc::operation_canceled

};

// Start server and receive assigned port when server is listening for requests

promise<unsigned short> server_port;

thread server_thread([&server, &server_port]() {

// Start server

server.start([&server_port](unsigned short port) {

server_port.set_value(port);

});

});

cout << "Server listening on port " << server_port.get_future().get() << endl

<< endl;

// Client examples

string json_string = "{\"firstName\": \"John\",\"lastName\": \"Smith\",\"age\": 25}";

// Synchronous request examples

{

HttpClient client("localhost:8080");

try {

cout << "Example GET request to http://localhost:8080/match/123" << endl;

auto r1 = client.request("GET", "/match/123");

cout << "Response content: " << r1->content.rdbuf() << endl // Alternatively, use the convenience function r1->content.string()

<< endl;

cout << "Example POST request to http://localhost:8080/string" << endl;

auto r2 = client.request("POST", "/string", json_string);

cout << "Response content: " << r2->content.rdbuf() << endl

<< endl;

}

catch(const SimpleWeb::system_error &e) {

cerr << "Client request error: " << e.what() << endl;

}

}

// Asynchronous request example

{

HttpClient client("localhost:8080");

cout << "Example POST request to http://localhost:8080/json" << endl;

client.request("POST", "/json", json_string, [](shared_ptr<HttpClient::Response> response, const SimpleWeb::error_code &ec) {

if(!ec)

cout << "Response content: " << response->content.rdbuf() << endl;

});

client.io_service->run();

}

server_thread.join();