How we can keep network logs debugging while developing iOS application?

 Answer: 

Debugging network logs while developing an iOS application involves monitoring and analyzing the data sent and received during network communication. Here's a guide to effectively debug network logs:

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1. Enable Networking Debugging in Your App

• Use tools like URLSession with logging enabled:

  
  let configuration = URLSessionConfiguration.default
  configuration.waitsForConnectivity = true
  configuration.networkServiceType = .default
  let session = URLSession(configuration: configuration)
  

• Add debug logging in URLSessionDelegate methods like:

  func urlSession(_ session: URLSession, task: URLSessionTask, 
  didCompleteWithError error: Error?) {
      if let error = error {
          print("Error: \(error.localizedDescription)")
      } else {
          print("Task completed successfully")
      }
  }
  

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2. Use Built-in Tools

• OSLog Framework: Replace print with os_log for more structured logging:

  import os
  let log = OSLog(subsystem: "com.yourApp.networking", category: "network")
  os_log("Network Request: %@", log: log, type: .info, url.absoluteString)
  

• Debug Navigator: Monitor real-time network activities in Xcode (View > Debug Navigator).

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3. Advanced Logging with Libraries

• Use Alamofire or Moya if using these frameworks for networking. They offer integrated logging capabilities:

  let session = Session(eventMonitors: [AlamofireLogger()])

• Implement interceptors for custom logging:

  class NetworkLogger: EventMonitor {
      func requestDidFinish(_ request: Request) {
          print("Request: \(request.description)")
      }
  }
  

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4. External Debugging Tools

• Charles Proxy or Proxyman:
  • Install and configure to intercept HTTP/HTTPS traffic.
  • View detailed logs for requests and responses, including headers, payloads, and status codes.
• Postman: Use it to replicate API calls outside the app for debugging server-side issues.

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5. Check for Common Issues

• Ensure proper timeout intervals in the URLSession configuration.
• Handle network failures like no internet or server downtime gracefully.
• Check HTTP status codes to verify server responses.

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6. Debugging HTTPS (SSL/TLS)

• Make sure your app supports SSL by checking certificates in the app.
• Use tools like TrustKit for detailed SSL debugging.

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7. Mock Responses

• Use frameworks like OHHTTPStubs to mock responses during development:

  stub(condition: isHost("api.yourserver.com")) { _ in
      let stubData = "Mock response".data(using: .utf8)!
      return HTTPStubsResponse(data: stubData, statusCode: 200, headers: nil)
  }
  

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8. Analyze Logs

• Use formatted logging to differentiate types of logs (request vs. response).
• Use tools like SwiftyBeaver or CocoaLumberjack for structured log management.