Proxy Object: The fetchLogger wraps the fetch function.
It uses the apply trap to intercept calls to fetch.Request Logging:Logs the url and options of the request.
Response Handling: Logs the response status, status text, and URL.
Clones the response to ensure the body can be read multiple times.Error Handling: Captures and logs any errors encountered during the fetch.
Using the Proxy: You can replace fetch globally by assigning the proxy to window.fetch.
// Create a logging wrapper for fetch using Proxy
const fetchLogger = new Proxy(fetch, {
apply: (target, thisArg, args) => {
// Log the request details
const [url, options] = args;
console.log("Fetch Request:");
console.log("URL:", url);
console.log("Options:", options);
// Call the original fetch function
return Reflect.apply(target, thisArg, args)
.then(response => {
// Log response details
console.log("Fetch Response:");
console.log("Status:", response.status);
console.log("Status Text:", response.statusText);
console.log("URL:", response.url);
// Return the response for further use
return response.clone(); // Clone to allow response reuse
})
.catch(error => {
// Log errors
console.error("Fetch Error:", error);
throw error; // Rethrow the error for caller handling
});
}
});
// Example usage of the logging fetch
fetchLogger("https://jsonplaceholder.typicode.com/posts", {
method: "GET",
headers: {
"Content-Type": "application/json"
}
})
.then(response => response.json())
.then(data => console.log("Data:", data))
.catch(error => console.error("Error in fetch:", error));
Replace Global fetch with Logging
window.fetch = fetchLogger;
The above is the detailed content of Logging System with Proxy and Fetch. For more information, please follow other related articles on the PHP Chinese website!
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