Created
November 24, 2020 16:28
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| <title> Detect 404 </title> | |
| </head> | |
| <body> | |
| <p>Hello.</p> | |
| <script src="detect_404.js"></script> | |
| </body> | |
| </html> |
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| // check if one URL is good or not | |
| function urlExists(url, callback) { | |
| fetch(url, { method: 'head' }) | |
| .then(function(status) { | |
| callback(status.ok) | |
| }); | |
| } | |
| // URLs in an array | |
| // bad - BlZ57nzj6xZ | |
| // good - BlafBtHniQQ | |
| const url_list = [ | |
| 'https://www.instagram.com/p/BlZ57nzj6xZ/', | |
| 'https://www.instagram.com/p/BlafBtHniQQ/' | |
| ]; | |
| // loop over all URLs in list | |
| for (let i = 0; i < url_list.length; i++ ) { | |
| url = url_list[i]; | |
| urlExists(url, function(exists) { | |
| if (exists) { | |
| // it exists, do something | |
| console.log("It is good."); | |
| } else { | |
| // it doesn't exist, do something else | |
| console.log("It is bad."); | |
| } | |
| }); | |
| } |
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