Safe Browsing - Chromium
www.chromium.org › design-documents › safebrowsingChecking the safe browsing database is a multistep process. The URL is hashed and a synchronous check against the in-memory prefix list is done. If no match is found, the URL is considered safe immediately. If the prefix matches, an asynchronous request is made to the safe browsing servers for a list of all full hashes matching that prefix.