Fetch-url-file-3a-2f-2f-2f -
When you see fetch-url-file-3A-2F-2F-2F , someone is likely trying to write (or encode) a command like:
:
fetch('file:///path/to/file.json') .then(response => response.json()) .then(data => console.log(data)); But as we’ll see, this usually in browsers. 2. Why fetch(file:///) Fails in Browsers Modern web browsers block JavaScript from accessing local files via file:/// for security reasons. Here’s why: a) Same-Origin Policy (SOP) Browsers treat file:/// as an opaque origin . A page loaded from file:/// has a different origin than any other file:/// path, making cross-file requests impossible. b) CORS Restrictions The file:// protocol does not support CORS headers. Even if you try to fetch a local file from another local file, the browser blocks it with an error like: Access to fetch at ‘file:///C:/data.json’ from origin ‘null’ has been blocked by CORS policy. c) Browser Vendor Security Choices Chrome, Firefox, Safari, and Edge explicitly disable fetch() and XMLHttpRequest to file:/// URIs to prevent malicious scripts from reading your hard drive without permission. fetch-url-file-3A-2F-2F-2F
Thus, fetch-url-file-3A-2F-2F-2F essentially refers to using the fetch() API in JavaScript to request a resource from the via the file:/// protocol. When you see fetch-url-file-3A-2F-2F-2F , someone is likely
However, that string looks like an encoded or malformed URI component — 3A is : and 2F is / in URL encoding, so file-3A-2F-2F-2F decodes to file:/// . Here’s why: a) Same-Origin Policy (SOP) Browsers treat
