Asp.Net Core http 請求顯示 Headers.ContentLength

Question

我正在做一個 http get 調用，我可以看到Headers.ContentLength總是返回 null 而我可以在 fiddler 中看到一個值：這是我的代碼

string url = $"url";

HttpClientHandler httpClientHandler = new HttpClientHandler();

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12 | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls;
httpClientHandler.ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => true;

HttpClient httpClient = new HttpClient(httpClientHandler)
{
    BaseAddress = new Uri(url)
};

httpClient.DefaultRequestHeaders.Accept.Clear();
httpClient.DefaultRequestHeaders.Add("Authorization", $"Token {authToken.Value}");
httpClient.DefaultRequestHeaders.Add("Accept-Encoding", "gzip, deflate");

httpClientHandler.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;

HttpResponseMessage response = await httpClient.GetAsync(string.Empty, HttpCompletionOption.ResponseHeadersRead);

response.EnsureSuccessStatusCode();


var responseString = await response.Content.ReadAsStringAsync();

var length = response.Content.Headers.ContentLength;

ContentLength 始終為空。 下面的提琴手顯示了正文長度和標題長度，我下載數據沒有任何問題。

我需要能夠讀取內容長度標頭來決定是否允許下載。 為什么我收到 null

Answer 1

在您的HttpResponseMessage response中設置一個斷點，以查看響應的狀態，並檢查哪一步是錯誤的，因為您的代碼作為一個整體是好的。