How to Perform Proxy Packet Capture and Data Flow Analysis on Mac

When debugging networks on macOS, packet capture is usually the first step. For example: App fails to request an API An API returns abnormal data Need to confirm parameters sent by the client For these issues, relying solely on code logs makes it difficult to judge network behavior; packet capture allows direct viewing of requests and responses. Below, through a debugging process, several common methods for packet capture on Mac are introduced. 1. First, Capture Network Requests from the Mac Itself If you need to view network requests from programs on the Mac itself, such as: Browser accessing APIs Desktop applications calling interfaces The simplest method is to use proxy packet capture tools, such as: Charles Proxyman SniffMaster These tools run locally and intercept requests via proxy. Configuring Proxy Packet Capture Steps are as follows: Start Charles or SniffMaster on Mac Check the proxy listening port, e.g., 8888 Enable system proxy in macOS network settings Set HTTP and HTTPS p