[英]Handling response values using HttpClient
我正在實現一項服務,該服務使 API 使用HttpClient
調用外部服務。 特別是其中一個調用並不總是返回與預期相同的答案。 實際上:
這是我的電話:
using (HttpClientHandler handler = new HttpClientHandler { Credentials = new NetworkCredential(key, "") })
using (HttpClient client = new HttpClient(handler))
{
client.Timeout = TimeSpan.FromMilliseconds(Timeout.Infinite);
HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, url);
using (HttpResponseMessage response = await client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead))
{
using (Stream body = await response.Content.ReadAsStreamAsync())
{
using (StreamReader reader = new StreamReader(body))
{
string read = string.Empty;
while (!reader.EndOfStream)
{
read += reader.ReadLine();
}
return JsonObject.Parse(read);
}
}
}
這是方面響應體 object:
{
"id" : 15,
"key" : "API_KEY",
"status" : "successful",
"sandbox" : true,
"created_at" : "2013-10-27T13:41:00Z",
"finished_at" : "2013-10-27T13:41:13Z",
"source_file" : {"id":2,"name":"testfile.pdf","size":90571},
"target_files" : [{"id":3,"name":"testfile.pptx","size":15311}],
"target_format" : "png",
"credit_cost" : 1
}
其中status
參數是successful
的,而target_files
參數是一個array of objects
。
然而,有時,答案基本上回來說它還沒有完成轉換(這個 API 是一個文件轉換服務),這種類型的主體:
{
"id" : 15,
"key" : "API_KEY",
"status" : "converting",
"sandbox" : true,
"created_at" : "2013-10-27T13:41:00Z",
"finished_at" : "2013-10-27T13:41:13Z",
"source_file" : {"id":2,"name":"testfile.pdf","size":90571},
"target_files" : [{}],
"target_format" : "png",
"credit_cost" : 0
}
其中status
參數正在converting
並且target_files
參數為空。
有一種方法可以管理調用以返回響應的 object 但僅在status
參數successfull
時才返回? 謝謝
一些 api 采用wait=1
參數或類似於等待的參數。 否則,您必須輪詢(可能是不同的網址)。
詳細信息應從您的 API 文檔中獲得。
按照建議,解決了輪詢請求:(客戶端在 scope 級別實例化)
for (int attempt = 0; attempt < maxAttempts; attempt++)
{
using (HttpRequestMessage request = new HttpRequestMessage(HttpMethod.Get, url))
{
TimeSpan delay = default;
using (HttpResponseMessage response = await _client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false))
{
if (response.IsSuccessStatusCode)
{
using (HttpContent content = response.Content)
{
string data = await content.ReadAsStringAsync().ConfigureAwait(false);
JsonValue value = JsonObject.Parse(data);
JsonValue status = value["status"] ?? string.Empty;
string statusString = status != null ? (string)status : string.Empty;
if (!string.IsNullOrEmpty(status) && statusString.Equals("successful", StringComparison.InvariantCultureIgnoreCase))
return value;
}
}
delay = response.Headers.RetryAfter?.Delta ?? TimeSpan.FromSeconds(3);
}
await Task.Delay(delay);
}
}
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