Capture traffic from sessions that own their configuration

Sources/NetworkInspector/NetworkInterceptor.swift

@@ -11,12 +11,16 @@ import Foundation
 final class NetworkInterceptor {
 
     private static var allowedBaseURLs: [String] = []
+    private static var isCapturing = false
 
     static func register() {
+        isCapturing = true
+        URLSessionConfiguration.installInspectorSwizzle()
         URLProtocol.registerClass(InspectorURLProtocol.self)
     }
 
     static func unregister() {
+        isCapturing = false
         URLProtocol.unregisterClass(InspectorURLProtocol.self)
     }
 
@@ -32,6 +36,7 @@ final class NetworkInterceptor {
     }
 
     static func shouldIntercept(_ url: URL?) -> Bool {
+        guard isCapturing else { return false }
         guard let absoluteString = url?.absoluteString.lowercased() else { return false }
         guard !allowedBaseURLs.isEmpty else { return true }
 

Sources/NetworkInspector/URLSessionConfigurationSwizzle.swift

@@ -0,0 +1,41 @@
+//
+//  URLSessionConfigurationSwizzle.swift
+//  NetworkInspector
+//
+//  Created by Revanth A on 26/08/26.
+//
+
+
+import Foundation
+import ObjectiveC
+
+extension URLSessionConfiguration {
+
+    private static var isSwizzled = false
+
+    @objc dynamic var inspector_protocolClasses: [AnyClass]? {
+        var classes = self.inspector_protocolClasses ?? []
+        if !classes.contains(where: { $0 == InspectorURLProtocol.self }) {
+            classes.insert(InspectorURLProtocol.self, at: 0)
+        }
+        return classes
+    }
+
+    static func installInspectorSwizzle() {
+        guard !isSwizzled else { return }
+
+        guard
+            let original = class_getInstanceMethod(
+                URLSessionConfiguration.self,
+                #selector(getter: URLSessionConfiguration.protocolClasses)
+            ),
+            let replacement = class_getInstanceMethod(
+                URLSessionConfiguration.self,
+                #selector(getter: URLSessionConfiguration.inspector_protocolClasses)
+            )
+        else { return }
+
+        method_exchangeImplementations(original, replacement)
+        isSwizzled = true
+    }
+}