如何使用 HttpClient 发出 OPTIONS 请求

Question

如何使用 System.Net.Http.HttpClient

发送 OPTIONS 请求

HttpClient 公开方法

删除异步
GetAsync
后异步
PutAsync
还有一些人.....

我期待 OptionsAsync

   switch (httpMethod) {
      case HTTP_METHODS.DELETE:
       {
        httpResponseMessage = httpClient.DeleteAsync(uri).Result;
        break;
       }
      case HTTP_METHODS.GET:
       {
        httpResponseMessage = httpClient.GetAsync(uri).Result;
        break;
       }
      case HTTP_METHODS.POST:
       {
        httpResponseMessage = httpClient.PostAsync(uri, httpContent).Result;
        break;
       }
      case HTTP_METHODS.PUT:
       {
        httpResponseMessage = httpClient.PutAsync(uri, httpContent).Result;
        break;
       }
      case HTTP_METHODS.OPTION:
       {
        //not sure what method to call on httpclient here to make Options request
        httpResponseMessage = httpClient.PutAsync(uri, httpContent).Result;
        if (httpResponseMessage.Headers.Contains("X-CSRF-TOKEN")) {
         IEnumerable < string > headerValues = httpResponseMessage.Headers.GetValues("X-CSRF-TOKEN");
         csrfToken = headerValues.FirstOrDefault();
        }
        break;
       } 
     }

Answer 1

没有针对此类方法的包装器（例如 OPTIONS 和 HEAD），但您可以使用 SendAsync，就像这些包装器一样：

var request = new HttpRequestMessage(HttpMethod.Options, "url");
var result = await _httpClient.SendAsync(request);

Answer 2

为了获得预期的响应，您必须确保在请求中设置“来源”header，如下所示：

using var client = new HttpClient();
var message = new HttpRequestMessage(HttpMethod.Options, "url");
message.Headers.Add("Origin", "http://example.com");
var response = await client.SendAsync(message);

如何使用 HttpClient 发出 OPTIONS 请求

how to make an OPTIONS request with HttpClient

c#

http

dotnet-httpclient