我正在尝试如下Typed
HttpClient
。我正在寻找一种仅将DefaultRequestHeaders
添加到我的POST
请求(而不添加到其他请求,例如GET
或PUT
)的方法。有没有办法做到这一点?
这是我的代码段。
var builder = services
.AddHttpClient("MyService", client =>
{
client.BaseAddress = configuration.BaseAddress;
// Need to default header only for "POST" request
client.DefaultRequestHeaders.Add("MyHeader", "MyHeaderValue");
})
.AddTypedClient<IMyServiceClient, MyServiceRestClient>();
我正在尝试找到一种方法,其中client.DefaultRequestHeaders.Add("MyHeader", "MyHeaderValue")
行仅对POST
请求有效。
具有最小配置,然后通过特定于http方法的执行来管理您的请求的可重用httpclient呢?
例如,考虑一个异步POST方法,该方法将覆盖配置请求/响应并使用您的httpclient执行的内部通用异步方法。您可以传入所需的标头和/或在此方法中设置默认标头。
public async Task<KeyValuePair<HttpResponseMessage, T>> PostAsync<T>(Uri uri, object data, AuthenticationHeaderValue authHeader = null, Dictionary<string, string> headers = null)
{
return await SendRequestAsync<T, object>(uri.ToString(), data, HttpMethod.Post, authHeader, headers);
}
内部方法如下:
private async Task<KeyValuePair<HttpResponseMessage, T>> SendRequestAsync<T, U>(string requestUri, U content, HttpMethod method, AuthenticationHeaderValue authHeader = null, Dictionary<string, string> headers = null)
{
using (HttpRequestMessage request = new HttpRequestMessage())
{
request.Method = method;
request.RequestUri = new Uri(requestUri, UriKind.Absolute);
request.Headers.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
if (authHeader != null)
{
request.Headers.Authorization = authHeader;
}
string requestContent = null;
if (content != null)
{
requestContent = JsonConvert.SerializeObject(content);
request.Content = new StringContent(requestContent, Encoding.UTF8, "application/json");
}
if (headers != null)
{
foreach (var header in headers)
{
if (!request.Headers.Contains(header.Key))
{
request.Headers.Add(header.Key, header.Value);
}
}
}
// _client would be a private implementation or injected version of your httpclient
using (HttpResponseMessage response = await _client.SendAsync(request))
{
if (response.IsSuccessStatusCode)
{
if (response.Content != null)
{
var rawJson = await response.Content.ReadAsStringAsync();
var mappedObj = JsonConvert.DeserializeObject<T>(rawJson);
var result = new KeyValuePair<HttpResponseMessage, T>(response, mappedObj);
return result;
}
}
else
{
// do something else
}
return new KeyValuePair<HttpResponseMessage, T>(response, default(T));
}
}
}