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我已经成功拿到了authorization_code。并得到"Error" : "invalid_request"回应authorization_code-token exchange。
这是我获取 Google OAuth 令牌以换取 authentication_code 的 java 代码：（
使用HttpComponents进行 HTTP 请求）

String urlString = "https://accounts.google.com/o/oauth2/token";
String client_id = "<my_client_id>";
String client_secret = "<my_client_secret>";
String redirect_uri = "<my_redirect_url>";
String grant_type = "authorization_code";
HttpParams params = new BasicHttpParams();
params.setParameter("code", code);
params.setParameter("client_id", client_id);
params.setParameter("client_secret", client_secret);
params.setParameter("redirect_uri", redirect_uri);
params.setParameter("grant_type", grant_type);
HttpPost post = new HttpPost(urlString);
post.addHeader("Content-Type", "application/x-www-form-urlencoded");
post.setParams(params);
DefaultHttpClient httpClient = new DefaultHttpClient();
try {
    HttpResponse response = httpClient.execute(post);
    HttpEntity entity = response.getEntity();
    System.out.println(response.toString());
    DataInputStream in = new DataInputStream(entity.getContent());
    String line;
    while ((line = in.readLine()) != null) {
        System.out.println(line);
    }
}

得到以下错误响应：

HTTP/1.1 400 Bad Request [Cache-Control: no-cache, no-store, max-age=0, must-revalidate, Pragma: no-cache, Expires: Fri, 01 Jan 1990 00:00:00 GMT, Date: Thu, 21 Feb 2013 11:39:04 GMT, Content-Type: application/json, X-Content-Type-Options: nosniff, X-Frame-Options: SAMEORIGIN, X-XSS-Protection: 1; mode=block, Server: GSE, Transfer-Encoding: chunked]
{
  "error" : "invalid_request"
}

有什么办法可以知道究竟是什么导致了错误？
或者你能发现这个请求有什么问题吗？

4

1 回答 1

3

虽然我没有使用 Apache 库的个人经验，但看起来参数是作为查询参数而不是发布的表单参数发送的。根据这个HttpClient Quick Start，它应该看起来像：

HttpPost httpPost = new HttpPost(urlString);
List <NameValuePair> nvps = new ArrayList <NameValuePair>();
nvps.add(new BasicNameValuePair("code", code));
nvps.add(new BasicNameValuePair("client_id", client_id));
nvps.add(new BasicNameValuePair("client_secret", client_secret));
nvps.add(new BasicNameValuePair("redirect_uri", redirect_uri));
nvps.add(new BasicNameValuePair("grant_type", grant_type));
httpPost.setEntity(new UrlEncodedFormEntity(nvps));
HttpResponse response = httpclient.execute(httpPost);
于 2013-03-16T22:55:33.187 回答