[英]httpClient.PutAsync() not updating, 415 Unsupported media type
[英]HttpClient.PutAsync - “Entity only allows writes with a JSON Content-Type header”
我有一個POST方法,可以完美地發布數據。
查看文檔,似乎PATCH(或PUT)應該看起來完全一樣,只是使用PutAsync
而不是PostAsync
。
做得很好,我得到以下錯誤:
+ postResponse {StatusCode: 400, ReasonPhrase: 'Bad Request', Version: 1.1, Content: System.Net.Http.NoWriteNoSeekStreamContent, Headers:
{
Cache-Control: private
Date: Mon, 09 Oct 2017 12:19:28 GMT
Transfer-Encoding: chunked
request-id: 60370069-f7c4-421d-842e-b1ee8573c2c2
client-request-id: 60370069-f7c4-421d-842e-b1ee8573c2c2
x-ms-ags-diagnostic: {"ServerInfo":{"DataCenter":"North Europe","Slice":"SliceB","ScaleUnit":"002","Host":"AGSFE_IN_7","ADSiteName":"DUB"}}
Duration: 3.2626
Content-Type: application/json
}} System.Net.Http.HttpResponseMessage
並回應:
實體僅允許使用JSON Content-Type標頭進行寫入
肯定在錯誤中,我也可以看到:
ContentType {text/plain; charset=utf-8} System.Net.Http.Headers.MediaTypeHeaderValue
因此,錯誤是有道理的,但是,我確實告訴它使用JSON,並且它按照相同的代碼在POST方法中按預期工作:
public async Task UpdateToGraph(object UnSerializedContent, string relativeUrl)
{
string accessToken = await _tokenManager.GetAccessTokenAsync();
HttpContent content = new StringContent(JsonConvert.SerializeObject(UnSerializedContent));
Client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
Client.DefaultRequestHeaders.Add("ContentType", "application/json");
string endpoint = "https://graph.microsoft.com/v1.0" + relativeUrl;
var postResponse = Client.PutAsync(endpoint, content).Result;
string serverResponse = postResponse.Content.ReadAsStringAsync().Result;
}
您可以使用.{Verb}AsJsonAsync
HttpClientExtensions方法。
public async Task UpdateToGraph(object UnSerializedContent, string relativeUrl) {
var accessToken = await _tokenManager.GetAccessTokenAsync();
Client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
Client.DefaultRequestHeaders.Add("ContentType", "application/json");
var endpoint = "https://graph.microsoft.com/v1.0" + relativeUrl;
var postResponse = await Client.PutAsJsonAsync(endpoint, UnSerializedContent);
var serverResponse = await postResponse.Content.ReadAsStringAsync();
}
還要注意不要通過將.Result
類的阻塞調用與async
方法混合使用來正確使用async / await,因為這可能導致死鎖。
使用StringContent構造函數設置內容類型:
HttpContent content = new StringContent(JsonConvert.SerializeObject(UnSerializedContent), System.Text.Encoding.UTF8, "application/json");
據我所知,在使用HttpClient時,您並不是要在請求對象上設置內容標頭。
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