[英]Httpclient calculating multiple url remote file size
我想计算 1000+ url 的总文件大小。 在任务运行时,我想显示当前数量和总数。 但是如果我添加您可以在我的代码中看到的信息,我会收到错误 ssl。
这是我得到的错误:
"Unhandled exception. System.Net.Http.HttpRequestException: The SSL connection could not be established, see inner exception.
---> System.IO.IOException: Received an unexpected EOF or 0 bytes from the transport stream.
at System.Net.Security.SslStream.ReceiveBlobAsync[TIOAdapter](TIOAdapter adapter)
at System.Net.Security.SslStream.ForceAuthenticationAsync[TIOAdapter](TIOAdapter adapter, Boolean receiveFirst, Byte[] reAuthenticationData, Boolean isApm)
at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Boolean async, Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at System.Net.Http.ConnectHelper.EstablishSslConnectionAsyncCore(Boolean async, Stream stream, SslClientAuthenticationOptions sslOptions, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.ConnectAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.CreateHttp11ConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.GetHttpConnectionAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean async, Boolean doRequestAuth, CancellationToken cancellationToken)
at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, Boolean async, CancellationToken cancellationToken)
at System.Net.Http.HttpClient.SendAsyncCore(HttpRequestMessage request, HttpCompletionOption completionOption, Boolean async, Boolean emitTelemetryStartStop, CancellationToken cancellationToken)"
您能否建议显示计数的最佳方式是什么?
#region GET REMOTE FILE SIZE
public static async Task<string> GetRemoteFileSize(this List<string> urls) {
long sum = 0;
long localSum = 0;
var tasks = new List<Task<long?>>();
for(int i = 0; i < urls.Count; i++) {
var url = urls[i];
tasks.Add(GetTotalBytes(url));
//if i will add here the counts, it's not getting the actual count
Console.Title = $"{i} of {urls.Count}";
}
for (int i = 0; i < tasks.Count; i++) {
Task<long?> task = tasks[i];
localSum += Convert.ToInt32(await task.ConfigureAwait(false));
Console.Title = $"{i} of {urls.Count}"; //if I will add this, I'm getting the SSL error even if I already added this " ServerCertificateCustomValidationCallback = (sender, cert, chain, sslPolicyErrors) => { return true; }," to my httpclient handler
}
await Task.WhenAll(tasks.ToArray()).ConfigureAwait(false);
return Interlocked.Add(ref sum, localSum).FormatFileSize();
}
private static async Task<long?> GetTotalBytes(string url) {
Uri uri = new Uri(url, UriKind.Absolute);
uri.SetServiceManagerConnection();
using var request = new HttpRequestMessage(HttpMethod.Head, uri);
request.AddAllCommonHeaders(uri);
using var response = await Client.SendAsync(request, HttpCompletionOption.ResponseHeadersRead).ConfigureAwait(false);
HttpStatusCode statusCode = response.StatusCode;
if (!response.IsSuccessStatusCode) {
throw new InvalidDataException($"Error occured: {statusCode} {(int)statusCode}");
}
return response.Content.Headers.ContentLength.GetValueOrDefault();
}
#endregion GET REMOTE FILE SIZE
// 我使用的 class
static string FormatBytes(this long bytes) {
var unit = 1024;
if (bytes < unit) { return $"{bytes} B"; }
var exp = (int)(Math.Log(bytes) / Math.Log(unit));
return $"{bytes / Math.Pow(unit, exp):F2} {("KMGTPE")[exp - 1]}B";
}
public static string FormatFileSize(this long bytes) => bytes.FormatBytes();
public static void SetServiceManagerConnection(this Uri uri) {
var sp = ServicePointManager.FindServicePoint(uri);
sp.ConnectionLimit = 20; //default 2 //The number of connections per end point.
sp.UseNagleAlgorithm = false; //Nagle’s algorithm is a means of improving the efficiency of TCP/IP networks by reducing the number of packets that need to be sent over the network
sp.Expect100Continue = false; //save bandwidth before sending huge object for post and put request to ensure remote end point is up and running.
sp.ConnectionLeaseTimeout = (int)TimeSpan.FromMinutes(1).TotalMilliseconds;//60 * 1000; // 1 minute
}
更新:这个是有效的:
static HttpClient Client { get; set; } = new(new HttpClientHandler {
Proxy = null,
UseProxy = false,
SslProtocols = (SslProtocols)(SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls13)
});
更新:当 HTTPS 出现 TLS 握手错误时,此错误很典型。 您应该指定 SecurityProtocol
System.Net.ServicePointManager.SecurityProtocol =
SecurityProtocolType.Tls | SecurityProtocolType.Tls11 | SecurityProtocolType.Tls12 | SecurityProtocolType.Tls13;
参考: https://docs.microsoft.com/en-us/dotnet/api/system.net.securityprotocoltype
正如其他人所提到的,您会收到 TLS 错误。
一旦你解决了这个问题,你正在做的操作的一个更快的方法将是 HTTP HEAD
,这只是返回给你的标题,你可以在其中看到大小。
请注意:并非所有服务器都允许HEAD
,特别是 AWS 例如。
此问题的答案显示如何使用HttpClient
执行此操作: HTTP HEAD request with HttpClient in .NET 4.5 和 C#
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.