1. Problems

When working with WKWebView, it's really difficult to capture the network traffic (HTTP/HTTPS) because WKWebView doesn't repsect the system proxy settings.

WKWebview doesn't offer the Network Console Tab like Safari does.

Therefore, there are no easy ways to capture the network traffic from WKWebView.

This blog will cover the following:

• How to capture HTTPS Traffic from WKWebView for iOS 17 or iOS 18 with Proxyman

2. Solution

Since iOS 17 and iOS 18, WKWebView has introduced the proxyConfigurations from WKWebsiteDataStore. It allows us to set the proxy for WKWebView. By leveraging this feature, we can easily capture the network traffic from WKWebView.

You can find the Documentation here: https://developer.apple.com/documentation/webkit/wkwebsitedatastore/4264546-proxyconfigurations

This tutorial demonstrates how to capture the network traffic from WKWebView for iOS 17/18 by using the Proxyman.

2.1. Prerequisites

1. Proxyman macOS: https://docs.proxyman.com/installation/macos-installation

2.2. Setup

1. Open your project in Xcode
2. Find your current WKWebView instance and add the following code

lazy var webView: WKWebView = {
  let webConfiguration = WKWebViewConfiguration()

  // ✅ define Proxy Setting to Proxyman
  let httpProxy = ProxyConfiguration(
      httpCONNECTProxy: NWEndpoint.hostPort(
          host: NWEndpoint.Host(
              "127.0.0.1"
          ),
          port: NWEndpoint.Port(
              integerLiteral: 9090
          )
      )
  )

  // ✅ Tell WKWebView to use the Proxy
  let dataSource = WKWebsiteDataStore.default()
  dataSource.proxyConfigurations = [httpProxy]
  webConfiguration.websiteDataStore = dataSource
  
  // init view
  let webView = WKWebView(
      frame: .zero,
      configuration: webConfiguration
  )
  webView.translatesAutoresizingMaskIntoConstraints = false
  return webView
}()

• Make sure to replace the 127.0.0.1 and 9090 with your Proxyman's IP and Port, which is the default value of Proxyman.
• If you're testing on a real device, you need the IP address of your macOS that you can find in the Proxyman Toolbar on the top of Proxyman Window.

iOS Simulator

• Install the certificate to your iOS Simulator by opening the Proxyman -> Certificate Menu -> Install to iOS -> Simulator -> Follow the instruction

Real iPhone/iPad Device

• Install the certificate to your iPhone/iPad by opening the Proxyman -> Certificate Menu -> Install to iOS -> Phyiscal Device -> Follow the instruction

3. ✅ Reload your iOS app and see the traffic on Proxyman

• All traffic from WKWebView will be captured and displayed in Proxyman.
• Works with HTTP/HTTPS from any third-party libraries, such as fetch, axios, XMLHttpRequest, etc.

4. What's next

• You can use the Proxyman Filter to filter out the traffic you want to debug.
• You can also use the Proxyman Replay to replay the traffic you want to debug.