This tool supports the synchronous request of the specified URL by setting multiple iframes. You can set the time of automatic URL refresh to efficiently realize the purpose of batch requests, especially for batch requests of some API interfaces. The tool avoids opening multiple tabs to affect the operation experience. Note: at present, only HTTPS protocol URLs are supported, because unsafe protocols will be blocked by browsers, such as chrome. If it is HTTP protocol, you can try other lower versions of browsers. At present, there are about 4-6 concurrent requests in the browser, and too many requests will be blocked by the browser.