Requêtte GET en c++

Requêtte GET en c++

Le problème exposé dans ce sujet a été résolu.

Bonjour, j’essaye depuis quelques heures de crée un petit programme pour faire des requête http et afficher le contenu d’une page web, dans ce cas, google.ca (.ca = Canada). Le résultat espéré final serait de pouvoir télécharger des vidéos sur youtube.. Un peu loin du but :lol:

Pas si pire pour un débutant.. :D

Donc,
le problème c’est que je n’arrive pas a afficher le code source de la page.. xd vous allez peut-être me dire que tu aurais pu utiliser boost::asio ou même cURL mais je trouve qu’on utilisant un système de socket() brut, on apprend mieux à connaitre ce qui se passe en dessous du moteur. Je pense que le problème viens de la requête que j’ai faite, surement mal écrite; Si quelqu’un pourrais me l’expliquer :)

Code d’erreur (merci debug): "Send() send a different number of bytes than expected 40" ligne 76-77 (Le programme se compile)

Merci :P

C0de :

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#include <WS2tcpip.h>
#include <iostream>
#include <string>
#include <Windows.h>

#pragma comment(lib,"ws2_32.lib")

using std::cout;
using std::endl;


void startUp();

int main()
{
    //wsaDate  ..
    startUp();


    //S0cket
    SOCKET ListeningSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (ListeningSocket == -1)
    {
        cout <<
            "Error at: Socket Error.. "
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }
    else
    {
        cout <<
            "Listening Socket Created Succefully!"
            << endl;
    }

    //C0nnection
    const char* IpAddress = "66.33.196.149";
    struct sockaddr_in  hint;
    hint.sin_family = AF_INET;
    hint.sin_port = htons(80);
    //hint.sin_addr.s_addr  = inet_addr(IpAddress); //Don't Use That _'TT_
    inet_pton(AF_INET, IpAddress, &hint.sin_addr);

    bind(ListeningSocket, (sockaddr*)&hint, sizeof(hint));
    int ConnectionHandleEst = connect(ListeningSocket, (struct sockaddr*)&hint, sizeof(hint));
    if (ConnectionHandleEst != 0)
    {
        cout <<
            "Error at : Can't connect to server Error "
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }
    else
    {
        cout <<
            "Connection established!"
            << endl;
    }
    //Request
    std::string request;
    request += "GET /HTTP/1.1\r\n";
    request += "Host: iamawesome.com\r\n";
    //request += "Connection: keep-alive";
    request += "\r\n";


    int Connection = send(ListeningSocket, request.c_str(), request.size() + 1, 0);
    if (Connection < 0)
    {
        cout <<
            "Send() sent a different number of bytes than expected " <<
            +request.length()
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }

    //Get Resp0nse
    char buffer[4096];
    int resp_length;
    std::string response;

    while (true)
    {
        resp_length = recv(ListeningSocket, buffer, 4096, 0);
        if (resp_length <= 0)
        {
            break;
        }
        response += std::string(buffer).substr(0, resp_length);
    }


    cout << response << endl;

    //Close s0cket
    closesocket(ListeningSocket);
    WSACleanup();

    system("PAUSE");

    return 0;
}

void startUp() {
    WSADATA wsaData;
    int wsaResult = MAKEWORD(2, 2);
    int iResult = WSAStartup(wsaResult, &wsaData);
    if (iResult != 0) {
        cout <<
            "Error at: Initializing Winsock.., Winsock 2.2 may be not supported by your system or simply not installed"
            << endl;
        return;

    }
    else
    {
        cout <<
            "[Winsock]Status : "
            << wsaData.szSystemStatus << endl;
    }
}
}
+0 -0

....

Résolu, il fallait ajouter un <= au lieu de < seulement a la ligne 88

Mais j’ai tout de même une quéstion, est-ce une bonne façon d’envoyer une requête GET de cette façon, bien structurer ?

J’ai ça comment réponse :

HTTP/1.0 400 Bad Request Content-Length: 54 Content-Type: text/html; charset=UTF-8 Date: Tue, 30 Jan 2018 00:24:57 GMT

Et comment dois je faire pour envoyer une requête vers zestedesavoir.com par exemple ou sur un site en local (127.0.0.1) ?

Résulat (iamawesome.com, 66.33.196.149) :

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<!doctype html>
<html>
<head>
    <title>Site not found &middot; DreamHost</title>
    <meta http-equiv="cache-control" content="no-cache" />
    <meta name="description" content="The owner of this domain has not yet uploaded their website." />
    <link rel="stylesheet" href="https://securendn.a.ssl.fastly.net/newpanel/css/singlepage.css" />
</head>
<body>
    <div class="page page-missing">
        <h1>Site Not Found</h1>

        <p>Well, this is awkward. The site you're looking for is not here.</p>
        <p><small>Is this your site? <a href="http://wiki.dreamhost.com/Site_not_found">Get more info</a> or <a href="https://panel.dreamhost.com/index.cgi?tree=support.msg">contact support</a>.</small></p>

        <a href="http://www.dreamhost.com/" class="logo">DreamHost</a>
    </div>
</body>
</html>

`

http://image.noelshack.com/fichiers/2018/05/2/1517276896-http-get-error-1.png

http://www.noelshack.com/2018-05-2-1517276896-http-get-error-1.png

Dernière version :

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#include <WS2tcpip.h>
#include <iostream>
#include <string>
#include <Windows.h>
#include <fstream>

#pragma comment(lib,"ws2_32.lib")

using std::cout;
using std::endl;
using std::ofstream;
#define MAX_BUFFLEN 4096
void startUp();

int main()
{
    //wsaDate  ..
    startUp();


    //S0cket
    SOCKET ListeningSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (ListeningSocket == -1)
    {
        cout <<
            "Error at: Socket Error.. "
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }
    else
    {
        cout <<
            "Listening Socket Created Succefully!"
            << endl;
    }

    //C0nnection
    const char* IpAddress = "66.33.196.149";
    struct sockaddr_in  hint;
    hint.sin_family = AF_INET;
    hint.sin_port = htons(80);
    //hint.sin_addr.s_addr  = inet_addr(IpAddress); //Don't Use That _'TT_
    inet_pton(AF_INET, IpAddress, &hint.sin_addr);

    bind(ListeningSocket, (sockaddr*)&hint, sizeof(hint));
    int ConnectionHandleEst = connect(ListeningSocket, (struct sockaddr*)&hint, sizeof(hint));
    if (ConnectionHandleEst != 0)
    {
        cout <<
            "Error at : Can't connect to server Error "
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }
    else
    {
        cout <<
            "Connection established!"
            << endl;
    }
    //Request
    std::string request;
    request += "GET /HTTP/1.0\r\n";
    request += "Host: iamawesome.com\r\n";
    //request += "Connection: keep-alive";
    request += "\r\n";


    int Connection = send(ListeningSocket, request.c_str(), request.size() + 1, 0);
    if (Connection < 0)
    {
        cout <<
            "Send() sent a different number of bytes than expected " <<
            +request.length()
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }
    else
    {
        cout << "\nContent:\n" 
            <<
            request
            << endl;
    }

    //Get Resp0nse
    char buffer[4096];
    int resp_length;
    std::string response;

    ofstream myfile;
    myfile.open("out_.html");

    if (Connection != SOCKET_ERROR)
    {
        do
        {
        //ZeroMemory(buffer, 4096);
        memset(buffer, 0, 4096);
        resp_length = recv(ListeningSocket, buffer, 4096, 0); 
        response += buffer;

        } while (resp_length != 0);
    }
    cout << response << endl;



    myfile << response;
    myfile.close();

    //Close s0cket
    closesocket(ListeningSocket);
    WSACleanup();
    system("PAUSE");

    return 0;
}

void startUp() {
    WSADATA wsaData;
    int wsaResult = MAKEWORD(2, 2);
    int iResult = WSAStartup(wsaResult, &wsaData);
    if (iResult != 0) {
        cout <<
            "Error at: Initializing Winsock.., Winsock 2.2 may be not supported by your system or simply not installed"
            << endl;
        return;

    }
    else
    {
        cout <<
            "[Winsock]Status : "
            << wsaData.szSystemStatus << endl;
    }
}
+0 -0

Et comment dois je faire pour envoyer une requête vers zestedesavoir.com par exemple ou sur un site en local (127.0.0.1) ?

PixarFilmz-

Tu dois d’abord résoudre zestedesavoir.com (DNS) pour obtenir son adresse IP et changer ta requête GET pour y mettre l’Host qui va bien.

Pour 127.0.0.1, pas de résolution à faire, mais tu dois t’assurer que tu as un serveur web qui tourne en local pour que cela fonctionne.

Essaie de voir de ce côté-là : https://msdn.microsoft.com/en-us/library/windows/desktop/ms682016(v=vs.85).aspx

+2 -0

Je sais vraiment pas comment faire là .. :(

J’obtient toujours la même réponse du serveur 400 Bad Request

J’envoya ça :

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request += "GET HTTP/1.0\r\n";
request += "Host: zestedesavoir.com\r\n";
request += "Connection: close\r\n";
request += "\r\n";

Comme réponse:

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  HTTP/1.1 400 Bad Request Server: nginx/1.12.2 Date: Wed, 31 Jan 2018 00:27:20 GMT Content-
  Type: text/html Content-Length: 173 Connection: close X-Xss-Protection: 1 X-Content-Type-
  Options: nosniff
  400 Bad Request
  nginx/1.12.2

Je vois pas ce qui cloche avec la requette..? ip92.243.7.44

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#include <WS2tcpip.h>
#include <iostream>
#include <string>
#include <Windows.h>
#include <fstream>

#pragma comment(lib,"ws2_32.lib")


using std::cout;
using std::endl;
using std::ofstream;
#define MAX_BUFFLEN 4096
void StartUp();

int main()
{
    //wsaDate  ..
    StartUp();


    //S0cket
    SOCKET ListeningSocket = socket(AF_INET, SOCK_STREAM, 0);
    if (ListeningSocket < 0)
    {
        cout <<
            "Error at: Socket Creation ListeningSocket().. "
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }
    else
    {
        cout <<
            "Listening Socket Created Succefully!"
            << endl;
    }

    //C0nnection
    //----------ARGUMENTS-----------------------------------------------------------------------
    std::string IpAddress = "92.243.7.44";
    struct sockaddr_in  hint;
    hint.sin_family = AF_INET;
    hint.sin_port = htons(80);
    //hint.sin_addr.s_addr  = inet_addr(IpAddress); //Don't Use That _'TT_
    inet_pton(AF_INET, IpAddress.c_str(), &hint.sin_addr);
    //----------ARGUMENTS-----------------------------------------------------------------------

    int ConnectionHandleEstablishement = connect(ListeningSocket, (struct sockaddr*)&hint, sizeof(hint));
    if (ConnectionHandleEstablishement < 0)
    {
        cout <<
            "Error at : Can't Connect ConnectionHandleEstablishement() Error"
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }
    else
    {
        cout <<
            "Connection established!"
            << endl;
    }
    //----------REQUEST-----------------------------------------------------------------------
    std::string request;
    request += "GET HTTP/1.0\r\n";
    request += "Host: zestedesavoir.com\r\n";
    request += "Connection: close\r\n";
    request += "\r\n";
    //request += "GET /HTTP/ 1.1 200 OK\r\nHost: zestedesavoir.com\r\n\r\n";
    //----------REQUEST-----------------------------------------------------------------------


    int Connection = send(ListeningSocket, request.c_str(), request.length(), 0);
    if (Connection < 0)
    {
        cout <<
            "Send() sent a different number of bytes than expected " <<
            +request.length()
            << endl;
        closesocket(ListeningSocket);
        WSACleanup();
        return 1;
    }
    else
    {
        cout << "\nRequest:\n" 
            <<
            request
            << endl;
    }

    //Get Resp0nse
    char buffer[4096];
    int resp_length = MAX_BUFFLEN;
    std::string response;

    ofstream myfile;
    myfile.open("out_.html");

        do
        {
        memset(buffer, 0, 4096);
        resp_length = recv(ListeningSocket, buffer, 4096, 0); 
        response += buffer;

        } while (resp_length <= 0);

    cout << response << endl;

    myfile << response;
    myfile.close();

    //Close s0cket
    closesocket(ListeningSocket);
    WSACleanup();
    system("PAUSE");

    return 0;
}

void StartUp() {
    WSADATA wsaData;
    int wsaResult = MAKEWORD(2, 2);
    int iResult = WSAStartup(wsaResult, &wsaData);
    if (iResult != 0) {
        cout <<
            "Error at: Initializing Winsock.., Winsock 2.2 may be not supported by your system or simply not installed"
            << endl;
        return;

    }
    else
    {
        cout <<
            "[Winsock]Status : "
            << wsaData.szSystemStatus << endl;
    }
}
+0 -0

Aaahhh… C’est ta requête qui n’est pas bonne. Essaie ça :

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request += "GET / HTTP/1.0\r\n";
request += "Host: zestedesavoir.com\r\n";
request += "Connection: close\r\n";
request += "\r\n";

Tu as oublié de préciser le path après ta méthode GET. Utilise HTTP/1.1 aussi.

+1 -0
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