HttpClient 正确使用方法

如何 正确模拟 Http请求，建议使用HttpClient

 

错误用法

    

var httpClient=new HttpClient();

 

正确用法

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1	ServiceCollection.AddHttpClient();

　

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public class Http: IHttp     {         private readonly IHttpClientFactory _httpClientFactory;         private readonly IJsonContext _jsonContext;         public Http(IServiceContext serviceContext)         {             _jsonContext = serviceContext.GetRequiredService<IJsonContext>();             _httpClientFactory = serviceContext.GetRequiredService<IHttpClientFactory>();         }             public async Task<TResponse> ExecuteAsync< TResponse>(HttpTypeEnum httpType, string url, Dictionary<string, string>? headers = null, CancellationToken cancellationToken = default)         {             try             {                 var httpClient = _httpClientFactory.CreateClient();                   HttpMethod httpMethod = httpType switch                 {                     HttpTypeEnum.Get => HttpMethod.Get,                     HttpTypeEnum.Patch => HttpMethod.Get,                     HttpTypeEnum.Post => HttpMethod.Get,                     HttpTypeEnum.Put => HttpMethod.Get,                     HttpTypeEnum.Delete => HttpMethod.Get,                     _ => HttpMethod.Get,                 };                 var httpRequestMessage = new HttpRequestMessage(httpMethod, url);                 if (headers != null)                 {                     foreach (var header in headers)                     {                         httpRequestMessage.Headers.Add(header.Key, header.Value);                     }                 }                   httpClient.Timeout = TimeSpan.FromSeconds(120);                 var httpResponseMessage = await httpClient.SendAsync(httpRequestMessage, cancellationToken);                 if (httpResponseMessage.IsSuccessStatusCode)                 {                     var responseJson = await httpResponseMessage.Content.ReadAsStringAsync(cancellationToken);                     var response = _jsonContext.Deserialize<TResponse>(responseJson);                     if (response is null)                     {                         throw new GrowHttpException($"接口请求错误,序列化错误 {responseJson}");                     }                     return response;                 }                 else                 {                     throw new GrowHttpException($"接口请求错误,错误代码{httpResponseMessage.StatusCode}，错误原因{httpResponseMessage.ReasonPhrase}");                 }             }             catch (GrowHttpException ex)             {                 throw ex;             }             catch (Exception ex)             {                 throw new GrowHttpException($"客户端调用异常：{ex.Message},接口地址：{url},调用堆栈{ex.StackTrace}");             }         }             public async Task<TResponse> ExecuteAsync<TRequest, TResponse>(HttpTypeEnum httpType, string url, TRequest request, Dictionary<string, string>? headers=null, CancellationToken cancellationToken = default)         {             try             {                 if (request is null)                 {                     throw new GrowHttpException($"接口请求错误, {nameof(request)} is null");                 }                 var requestJson = _jsonContext.Serialize(request);                 if (requestJson is null)                 {                     throw new GrowHttpException($"接口请求错误,序列化错误 {nameof(request)}");                 }                 var httpClient = _httpClientFactory.CreateClient();                 HttpMethod httpMethod = httpType switch                 {                     HttpTypeEnum.Get => HttpMethod.Get,                     HttpTypeEnum.Patch => HttpMethod.Get,                     HttpTypeEnum.Post => HttpMethod.Get,                     HttpTypeEnum.Put => HttpMethod.Get,                     HttpTypeEnum.Delete => HttpMethod.Get,                     _ => HttpMethod.Get,                 };                 var httpRequestMessage = new HttpRequestMessage(httpMethod, url);                 if (headers != null)                 {                     foreach (var header in headers)                     {                         httpRequestMessage.Headers.Add(header.Key, header.Value);                     }                 }                   httpRequestMessage.Content = new StringContent(requestJson);                   httpClient.Timeout = TimeSpan.FromSeconds(120);                 var httpResponseMessage = await httpClient.SendAsync(httpRequestMessage, cancellationToken);                 if (httpResponseMessage.IsSuccessStatusCode)                 {                     var responseJson = await httpResponseMessage.Content.ReadAsStringAsync(cancellationToken);                     var response = _jsonContext.Deserialize<TResponse>(responseJson);                     if (response is null)                     {                         throw new GrowHttpException($"接口请求错误,序列化错误 {responseJson}");                     }                     return response;                 }                 else                 {                     throw new GrowHttpException($"接口请求错误,错误代码{httpResponseMessage.StatusCode}，错误原因{httpResponseMessage.ReasonPhrase}");                 }             }             catch (GrowHttpException ex)             {                 throw ex;             }             catch (Exception ex)             {                 throw new GrowHttpException($"客户端调用异常：{ex.Message},接口地址：{url},调用堆栈{ex.StackTrace}");             }         }                   }

　　

　通过依赖注入 通过IHttpClientFactory  使用连接池复用HttpClient