如何直接使用curl获取Google OAuth 2.0访问令牌？ （不使用Google库）
我正在尝试遵循此教程，以使用他们的Google身份验证OAuth 2.0 API。但是，我想直接进行 curl 调用，而不要使用它们的库。
I'm trying to follow this tutorial to authenticate with Google using their OAuth 2.0 API. However, I would like to make straight curl calls rather than use their libraries.
我已经获得了我的客户ID和客户端密钥。
现在，我正在尝试获取访问令牌，如下所示：
I have obtained my Client ID and Client Secret Key. Now I'm trying to get the access token like this:
curl \
--request POST \
--header "Content-Type: application/json" \
--data '{
"client_id":"MY_CLIENT_ID",
"client_secret":"MY_SECRET_KEY",
"redirect_uri": "http://localhost/etc",
"grant_type":"authorization_code"
}' \
"https://accounts.google.com/o/oauth2/token"
但是，它不起作用。它给了我以下错误：
However, it is not working. It gives me the following error:
{
"error" : "invalid_request",
"error_description" : "Required parameter is missing: grant_type"
}
有人可以提供我示例吗？ curl调用以获取访问令牌（和刷新令牌）？
Can someone please provide me sample curl call to obtain the access token (and refresh token)?
a）您提供的数据应采用表单编码表示为JSON对象，并且b）您还应该在 code参数中提供授权码值。例如：
a) the data you provide should be form-encoded instead of presented as a JSON object and b) you should also provide an authorization code value in the "code" parameter. E.g.:
curl -d "client_id=MY_CLIENT_ID&\
client_secret=MY_SECRET_KEY&\
redirect_uri=http://localhost/etc&\
grant_type=authorization_code&\
code=CODE" https://oauth2.googleapis.com/token