在VC ++中使用REST服务时出错

Question

我使用下面的代码作为示例来使用VC ++中的REST服务。我收到一条错误，指出“无法建立与服务器的连接”。我的系统的IIs版本是IIS 6.0。请让我知道可能是什么问题。提前谢谢。

#include "stdafx.h"
#include "http_client.h"
#include "filestream.h"
#include "iostream"
#include "sstream"
#include "conio.h"
#include "Windows.h"


using namespace utility;                    
using namespace web;                       
using namespace web::http;                 
using namespace web::http::client;         
using namespace concurrency::streams;


int _tmain(int argc, _TCHAR* argv[])
{
    auto fileStream = std::make_shared<ostream>();

    // Open stream to output file.
    pplx::task<void> requestTask = fstream::open_ostream(U("results.html")).then([=](ostream outFile)
    {
        *fileStream = outFile;

        // Create http_client to send the request.

            http_client client(U("http://www.bing.com/")); 
            uri_builder builder(U("/search"));
            builder.append_query(U("q"), U("Casablanca CodePlex"));
            return client.request(methods::GET, builder.to_string());


        // Build request URI and start the request.


    })

        // Handle response headers arriving.
        .then([=](http_response response)
    {
        printf("Received response status code:%u\n", response.status_code());

        // Write response body into the file.
        return response.body().read_to_end(fileStream->streambuf());
    })

        // Close the file stream.
        .then([=](size_t)
    {
        return fileStream->close();
    });

    // Wait for all the outstanding I/O to complete and handle any exceptions
    try
    {
        requestTask.wait();
    }
    catch (const std::exception &e)
    {
        printf("Error exception:%s\n", e.what());
    }

    Sleep(5000);
    return 0;
}