Proxy-url-file-3a-2f-2f-2f -

When decoded, that becomes: proxy-url-file:/// Now we have something recognizable: proxy-url-file:///

Notice there are before the 3A and 2F . This is the first sign of corruption. The original data likely looked like this: proxy-url-file-3A-2F-2F-2F

You have encountered a string that is not a word, not a standard code, and not a live link. It is, in fact, a —a fragment of a URL that has been partially encoded, partially truncated, and stripped of its context. When decoded, that becomes: proxy-url-file:/// Now we have