c++ - 谷歌oauth2.0，必需的参数丢失: grant_type

Question

我按照谷歌文档为我公司的桌面应用做了一个“用谷歌登录”，文档链接: https://developers.google.com/identity/protocols/OAuth2InstalledApp

问题是当我发送一个检索 access_token 的 post 请求时，我总是收到这个错误:

“错误”:“无效请求”

“error_description”:“缺少必需的参数:grant_type”

我确实在 Google 上搜索了几天，但不知道发生了什么。如果这是一个愚蠢的问题，请原谅我，我对 http 一无所知。

这是我的代码。在我的代码中，我使用此链接中的库: http://www.codeproject.com/Articles/66625/A-Fully-Featured-Windows-HTTP-Wrapper-in-C

#include "RegExp.h"
#include "StringProcess.h"
#include "WinHttpClient.h"

#include <iostream>

using namespace std;

void main(void)
{
    WinHttpClient client(L"https://accounts.google.com/o/oauth2/token");

    //data of post request
    string data = "";

    data += "code=";
    string code = "some_code";
    data += code;

    data += "&client_id=";
    string client_id = "my_app_id";
    data += client_id;

    data += "&client_secret=";
    string client_secret = "my_app_secret";
    data += client_secret;

    data += "&redirect_uri";
    string redirect_uri = "urn:ietf:wg:oauth:2.0:oob";
    data += redirect_uri;

    data += "&grant_type=";
    string grant_type = "authorization_code";
    data += grant_type;


    client.SetAdditionalDataToSend((BYTE *)data.c_str(), data.size());

    //header of post request
    wstring headers = L"Content-Length: ";
    headers += L"\r\nContent-Type: application/x-www-form-urlencoded\r\n";
    wchar_t szHeaders[MAX_PATH * 10] = L"";
    swprintf_s(szHeaders, MAX_PATH * 10, headers.c_str(), data.size());
    client.SetAdditionalRequestHeaders(szHeaders);

    //send request and print response
    client.SendHttpRequest(L"POST");

    wstring httpResponseHeader = client.GetResponseHeader();
    wstring httpResponseContent = client.GetResponseContent();

    char content[10000];
    sprintf(content, "%ls", httpResponseContent.c_str() );

    char header[10000];
    sprintf(header, "%ls", httpResponseHeader.c_str());

    cout << header  << endl;
    cout << content << endl;

    system("pause");
}

非常感谢

Answer 1

您的 redirect_uri 必须是 real URI如果“redirect_uri”参数包含在第 4.1.1 节(RFC 6749)中所述的授权请求中，则必须匹配，并且它们的值必须相同。 uri 必须类似于 scheme:[//[user:password@]host[:port]][/]path