您能否指出正确的方法和参数集：
在 Postman 中使用 PKCE 向我的身份端点 (https://.../login) 发出授权请求 在附件中有发送的参数列表。作为我使用的 grant_type 值-> authorization_code 不幸的是，我收到“错误请求”，邮递员中的 Invalid_grant
发出访问令牌请求。在此请求中，我收到无效请求。我想我错过了参数刷新令牌，但我不知道如何获取/生成它：
我编写了 Azure 函数的代码来请求访问令牌，不幸的是我从令牌端点得到 {"error":"invalid_request"}。这是我的代码，你能告诉我我做错了什么吗？
[FunctionName("GetAccessToken")]
public async Task<IActionResult> GetAccessToken(
[HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = null)] HttpRequest req,
ILogger log)
{
try
{
log.LogInformation("C# HTTP trigger function ''GetAccessToken'' processed a request.");
string clientSecret = "some secret";
string accessToken = "";
RequestAccessToken rT = new RequestAccessToken();
rT.Code = req.Form["code"];
rT.RedirectUri = req.Form["redirect_uri"];
rT.GrantType = req.Form["grant_type"];
rT.ClientId = req.Form["client_id"];
rT.CodeVerifier = req.Form["code_verifier"];
using (var client = new HttpClient())
{
client.BaseAddress = new Uri("https://<access_token_endpoint_base_uri>");
client.DefaultRequestHeaders
.Accept
.Add(new MediaTypeWithQualityHeaderValue("application/x-www-form-urlencoded"));//ACCEPT header
var body = new { EntityState = new {
code = rT.Code,
redirect_uri = rT.RedirectUri,
grant_type = rT.GrantType,
client_id = rT.ClientId,
client_secret = clientSecret,
code_verifier = rT.CodeVerifier
} };
var result = await client.PostAsJsonAsync(
"/login",
body);
accessToken = await result.Content.ReadAsStringAsync();
}
return new OkObjectResult(accessToken);
}
catch (Exception ex)
{
log.LogInformation(ex.ToString());
return new ObjectResult(ex.ToString()) { StatusCode = 500 };
}
}