Parsing - Is it valid to have more than one question mark in a URL? - Stack Overflow
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parsing - Is it valid to have more than one question mark in a URL? - Stack Overflow (Yes.)
Yes, it is valid. Only the first ? in a URL has significance, any after it are treated as literal question marks:
The query component is indicated by the first question mark ("?") character and terminated by a number sign ("#") character or by the end of the URI.