dlib C++ Library - server_http_ex.cpp
// The contents of this file are in the public domain. See LICENSE_FOR_EXAMPLE_PROGRAMS.txt
/*
This example illustrates the use of the HTTP extension to the server object
from the dlib C++ Library.
It creates a server that always responds with a simple HTML form.
To view the page this program displays you should go to http://localhost:5000
*/
#include <iostream>
#include <sstream>
#include <string>
#include <dlib/server.h>
using namespace dlib;
using namespace std;
class web_server : public server_http
{
const std::string on_request (
const incoming_things& incoming,
outgoing_things& outgoing
)
{
ostringstream sout;
// We are going to send back a page that contains an HTML form with two text input fields.
// One field called name. The HTML form uses the post method but could also use the get
// method (just change method='post' to method='get').
sout << " <html> <body> "
<< "<form action='/form_handler' method='post'> "
<< "User Name: <input name='user' type='text'><br> "
<< "User password: <input name='pass' type='text'> <input type='submit'> "
<< " </form>";
// Write out some of the inputs to this request so that they show up on the
// resulting web page.
sout << "<br> path = " << incoming.path << endl;
sout << "<br> request_type = " << incoming.request_type << endl;
sout << "<br> content_type = " << incoming.content_type << endl;
sout << "<br> protocol = " << incoming.protocol << endl;
sout << "<br> foreign_ip = " << incoming.foreign_ip << endl;
sout << "<br> foreign_port = " << incoming.foreign_port << endl;
sout << "<br> local_ip = " << incoming.local_ip << endl;
sout << "<br> local_port = " << incoming.local_port << endl;
sout << "<br> body = \"" << incoming.body << "\"" << endl;
// If this request is the result of the user submitting the form then echo back
// the submission.
if (incoming.path == "/form_handler")
{
sout << "<h2> Stuff from the query string </h2>" << endl;
sout << "<br> user = " << incoming.queries["user"] << endl;
sout << "<br> pass = " << incoming.queries["pass"] << endl;
// save these form submissions as cookies.
outgoing.cookies["user"] = incoming.queries["user"];
outgoing.cookies["pass"] = incoming.queries["pass"];
}
// Echo any cookies back to the client browser
sout << "<h2>Cookies the web browser sent to the server</h2>";
for ( key_value_map::const_iterator ci = incoming.cookies.begin(); ci != incoming.cookies.end(); ++ci )
{
sout << "<br/>" << ci->first << " = " << ci->second << endl;
}
sout << "<br/><br/>";
sout << "<h2>HTTP Headers the web browser sent to the server</h2>";
// Echo out all the HTTP headers we received from the client web browser
for ( key_value_map_ci::const_iterator ci = incoming.headers.begin(); ci != incoming.headers.end(); ++ci )
{
sout << "<br/>" << ci->first << ": " << ci->second << endl;
}
sout << "</body> </html>";
return sout.str();
}
};
int main()
{
try
{
// create an instance of our web server
web_server our_web_server;
// make it listen on port 5000
our_web_server.set_listening_port(5000);
// Tell the server to begin accepting connections.
our_web_server.start_async();
cout << "Press enter to end this program" << endl;
cin.get();
}
catch (exception& e)
{
cout << e.what() << endl;
}
}