Serving large files with C# HttpListener

Serving large files with C# HttpListener

To serve large files with C# HttpListener, you can use the FileStream class to read the file in chunks and write it to the response stream. Here's an example of how to do it:

string filePath = "path/to/large/file"; HttpListenerContext context = // Get the HttpListenerContext // Set the content type and length context.Response.ContentType = "application/octet-stream"; context.Response.ContentLength64 = new FileInfo(filePath).Length; // Set the headers for file download context.Response.Headers.Add("Content-Disposition", "attachment; filename=\"" + Path.GetFileName(filePath) + "\""); context.Response.Headers.Add("Content-Transfer-Encoding", "binary"); // Open the file stream using (FileStream fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read)) { // Read and write the file in chunks byte[] buffer = new byte[4096]; int bytesRead = 0; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0) { context.Response.OutputStream.Write(buffer, 0, bytesRead); context.Response.OutputStream.Flush(); } } // Close the response stream context.Response.OutputStream.Close();

In this example, we first get the HttpListenerContext object for the request. We then set the content type and length for the response, and add headers to indicate that the file should be downloaded as an attachment. We open a FileStream for the file and read and write it in chunks using a buffer. Finally, we close the response stream. Note that we flush the response stream after each chunk to ensure that the data is sent immediately to the client.

Examples

  1. "C# HttpListener large file download"

    • Description: Learn how to serve large files using C# HttpListener for efficient and scalable file downloads.
    • Code:
      // Using HttpListener using System.Net; using System.IO; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests HttpListenerContext context = listener.GetContext(); HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Stream large file content to the response using (FileStream fileStream = File.OpenRead("path/to/largeFile.zip")) { fileStream.CopyTo(response.OutputStream); } // Close the response and stop listening response.Close(); listener.Stop();

  2. "C# HttpListener chunked transfer encoding"

    • Description: Implement chunked transfer encoding for serving large files with C# HttpListener, providing efficient streaming of file content.
    • Code:
      // Using HttpListener using System.Net; using System.IO; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests HttpListenerContext context = listener.GetContext(); HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); response.SendChunked = true; // Stream large file content in chunks to the response using (FileStream fileStream = File.OpenRead("path/to/largeFile.zip")) { byte[] buffer = new byte[8192]; int bytesRead; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0) { response.OutputStream.Write(buffer, 0, bytesRead); response.OutputStream.Flush(); } } // Close the response and stop listening response.Close(); listener.Stop();

  3. "C# HttpListener range requests"

    • Description: Support HTTP Range requests to enable partial downloads and resume capabilities when serving large files with C# HttpListener.
    • Code:
      // Using HttpListener using System.Net; using System.IO; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests HttpListenerContext context = listener.GetContext(); HttpListenerRequest request = context.Request; HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Get requested range from the request headers long startRange = 0; long endRange = long.MaxValue; if (request.Headers["Range"] != null) { string rangeHeader = request.Headers["Range"]; string[] rangeValues = rangeHeader.Split('=')[1].Split('-'); startRange = long.Parse(rangeValues[0]); endRange = rangeValues.Length > 1 ? long.Parse(rangeValues[1]) : long.MaxValue; } // Stream the requested range of the large file content to the response using (FileStream fileStream = File.OpenRead("path/to/largeFile.zip")) { response.ContentLength64 = endRange - startRange + 1; fileStream.Seek(startRange, SeekOrigin.Begin); byte[] buffer = new byte[8192]; int bytesRead; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0) { response.OutputStream.Write(buffer, 0, bytesRead); response.OutputStream.Flush(); } } // Close the response and stop listening response.Close(); listener.Stop();

  4. "C# HttpListener download speed throttling"

    • Description: Implement download speed throttling to control the rate of serving large files with C# HttpListener.
    • Code:
      // Using HttpListener using System.Net; using System.IO; using System.Threading; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests HttpListenerContext context = listener.GetContext(); HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Stream large file content with download speed throttling using (FileStream fileStream = File.OpenRead("path/to/largeFile.zip")) { byte[] buffer = new byte[8192]; int bytesRead; long totalBytesSent = 0; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0) { response.OutputStream.Write(buffer, 0, bytesRead); response.OutputStream.Flush(); totalBytesSent += bytesRead; // Throttle download speed (adjust the value to control speed) Thread.Sleep(10); } } // Close the response and stop listening response.Close(); listener.Stop();

  5. "C# HttpListener file integrity verification"

    • Description: Implement file integrity verification while serving large files with C# HttpListener to ensure the integrity of downloaded files.
    • Code:
      // Using HttpListener using System.Net; using System.IO; using System.Security.Cryptography; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests HttpListenerContext context = listener.GetContext(); HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Stream large file content with integrity verification using (FileStream fileStream = File.OpenRead("path/to/largeFile.zip")) { byte[] buffer = new byte[8192]; int bytesRead; using (var md5 = MD5.Create()) { while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0) { response.OutputStream.Write(buffer, 0, bytesRead); response.OutputStream.Flush(); // Update MD5 hash for integrity verification md5.TransformBlock(buffer, 0, bytesRead, buffer, 0); } md5.TransformFinalBlock(buffer, 0, 0); string calculatedHash = BitConverter.ToString(md5.Hash).Replace("-", "").ToLower(); // Verify file integrity bool integrityVerified = calculatedHash.Equals("expected-hash", StringComparison.OrdinalIgnoreCase); } } // Close the response and stop listening response.Close(); listener.Stop();

  6. "C# HttpListener parallel file downloads"

    • Description: Explore techniques for serving large files concurrently with C# HttpListener to improve download performance.
    • Code:
      // Using HttpListener using System.Net; using System.IO; using System.Threading.Tasks; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests concurrently while (true) { HttpListenerContext context = await listener.GetContextAsync(); Task.Run(() => HandleRequestAsync(context)); } async Task HandleRequestAsync(HttpListenerContext context) { HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Stream large file content to the response (similar to previous examples) // ... // Close the response response.Close(); }

  7. "C# HttpListener file download resumable"

    • Description: Implement resumable file downloads with C# HttpListener to allow users to resume interrupted downloads.
    • Code:
      // Using HttpListener using System.Net; using System.IO; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests HttpListenerContext context = listener.GetContext(); HttpListenerRequest request = context.Request; HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Get requested range from the request headers (similar to previous examples) // ... // Stream the requested range of the large file content to the response (similar to previous examples) // ... // Close the response and stop listening response.Close(); listener.Stop();

  8. "C# HttpListener large file download cancellation"

    • Description: Implement the ability to cancel or interrupt large file downloads with C# HttpListener.
    • Code:
      // Using HttpListener using System.Net; using System.IO; using System.Threading; // Create a CancellationTokenSource for cancellation CancellationTokenSource cancellationTokenSource = new CancellationTokenSource(); // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests HttpListenerContext context = listener.GetContext(); HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Stream large file content to the response with cancellation support using (FileStream fileStream = File.OpenRead("path/to/largeFile.zip")) { byte[] buffer = new byte[8192]; int bytesRead; long totalBytesSent = 0; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0) { response.OutputStream.Write(buffer, 0, bytesRead); response.OutputStream.Flush(); totalBytesSent += bytesRead; // Check for cancellation and exit the loop if (cancellationTokenSource.Token.IsCancellationRequested) { break; } } } // Close the response and stop listening response.Close(); listener.Stop();

  9. "C# HttpListener file download authentication"

    • Description: Implement authentication mechanisms for serving large files with C# HttpListener to control access to the files.
    • Code:
      // Using HttpListener using System.Net; using System.IO; using System.Text; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests with authentication HttpListenerContext context = listener.GetContext(); HttpListenerRequest request = context.Request; HttpListenerResponse response = context.Response; // Perform authentication (e.g., check credentials, tokens, etc.) string username = "user"; string password = "password"; string authorizationHeader = request.Headers["Authorization"]; if (authorizationHeader != null) { string[] credentials = Encoding.UTF8.GetString(Convert.FromBase64String(authorizationHeader.Substring("Basic ".Length))).Split(':'); if (credentials.Length == 2 && credentials[0] == username && credentials[1] == password) { // Authentication successful // Proceed with serving the file } else { // Authentication failed response.StatusCode = (int)HttpStatusCode.Unauthorized; response.Close(); listener.Stop(); return; } } else { // No authorization header provided response.StatusCode = (int)HttpStatusCode.Unauthorized; response.Close(); listener.Stop(); return; } // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Stream large file content to the response using (FileStream fileStream = File.OpenRead("path/to/largeFile.zip")) { byte[] buffer = new byte[8192]; int bytesRead; while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0) { response.OutputStream.Write(buffer, 0, bytesRead); response.OutputStream.Flush(); } } // Close the response and stop listening response.Close(); listener.Stop();

  10. "C# HttpListener file download logging"

    • Description: Implement logging mechanisms to capture download activity and statistics when serving large files with C# HttpListener.
    • Code:
      // Using HttpListener using System.Net; using System.IO; using System.Diagnostics; // Create HttpListener HttpListener listener = new HttpListener(); listener.Prefixes.Add("http://localhost:8080/"); // Start listening listener.Start(); // Handle incoming requests with logging HttpListenerContext context = listener.GetContext(); HttpListenerResponse response = context.Response; // Set content type and headers response.ContentType = "application/octet-stream"; response.AddHeader("Content-Disposition", "attachment; filename=\"largeFile.zip\""); // Stream large file content to the response with logging using (FileStream fileStream = File.OpenRead("path/to/largeFile.zip")) { byte[] buffer = new byte[8192]; int bytesRead; long totalBytesSent = 0; Stopwatch stopwatch = Stopwatch.StartNew(); while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) > 0) { response.OutputStream.Write(buffer, 0, bytesRead); response.OutputStream.Flush(); totalBytesSent += bytesRead; } stopwatch.Stop(); // Log download statistics (e.g., duration, total bytes sent, etc.) Console.WriteLine($"Download completed in {stopwatch.Elapsed.TotalSeconds} seconds. Total bytes sent: {totalBytesSent}"); } // Close the response and stop listening response.Close(); listener.Stop();

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