Are you trying to a file or upload one to a server? The Art Of Scripting HTTP Requests Using curl
Although the specific report you requested does not exist, the underlying concept raises several security concerns relevant to software development and system administration: curl-url-file-3A-2F-2F-2F
Browsers often have strict (Cross-Origin Resource Sharing) policies that prevent local files from making certain requests. Using curl file:/// allows you to interact with local files in a "clean, policy-free testing environment" that bypasses these browser-enforced restrictions. Are you trying to a file or upload one to a server