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This is some code I wrote to reliable handle deprecated browsers with nodeJS and express

Why

Because I was bored...and because I can

Was this an excuse to boot up xp and play around with serveral legacy browsers

Yes

Are you taking this code submission seriously?

No->C'mon, who uses Netscape in 2021? (When Firefox exists)

'Supported' browsers [Browsers this will throw out]

• Netscape Navigator 1.0+
• Internet explorer 1.5+ (Could not get any earlier version to function in a vm for long enought to test)
• Mosaic 1.0* (I don't understand how to format html for this browser, but sending the code 505 works

How this works

First the server checks for the presence of a user agent (Mosaic doesn't send one)
Then it checks for the Mozilla tag (All browsers will send this tag)

If the Mozilla tag is marked as version 4 or below then the server sends a stripped down version of the unsupported page. This is done as one cannot be sure that a set legacy browser can even run javascript. If the browser says it's compliant with Mozilla version 5 and up. Then the responsibility for the needed checks are done on the client.

Just a note

I had to resort to using some pre-CSS era tags to insure that the unsupported web page will always load correctly. Also, have fun testing and breaking my scripting!