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Editorial Team
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Asked: 2026-06-17T02:40:33+00:00

I have a querystring parameter that is an encoded string that gets converted to

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I have a querystring parameter that is an encoded string that gets converted to Base64. That parameter is then embedded in a link within an email. When I click the link in the email, the querystring parameter has had all the + characters within it replaced by space characters. There are no other differences. Is there a method I can call to sanitise the string and effectively replace the spaces with pluses again. I’m currently doing a string replace which is a bit fat hack. Something is causing the replacement but I’m not sure what. Has anyone come across anything like this before?

Example – querystring parameter value within URL of the browser:

yo3rZZbZyG4UCN+L3pcTYJXmWEggnkW1qcyJk2uBrVTtGUSKIlBcJ8e9TSx8BHjHJv0JhI8H6LbIqUl+3lA7qn+lOgpSi3rCGN4bm5moOWcCA449C1Z3zj7J1FkOXH2HMox4VUZ7x7fF65MRwuBBmw==

Value of string within controller action:

yo3rZZbZyG4UCN L3pcTYJXmWEggnkW1qcyJk2uBrVTtGUSKIlBcJ8e9TSx8BHjHJv0JhI8H6LbIqUl 3lA7qn lOgpSi3rCGN4bm5moOWcCA449C1Z3zj7J1FkOXH2HMox4VUZ7x7fF65MRwuBBmw==

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1 Answer

  1. Editorial Team

    You should URL encode the base64 string to the link, so it is:

    yo3rZZbZyG4UCN%2BL3pcTYJXmWEggnkW1qcyJk2uBrVTtGUSKIlBcJ8e9TSx8BHjHJv0JhI8H6LbIqUl%2B3lA7qn%2BlOgpSi3rCGN4bm5moOWcCA449C1Z3zj7J1FkOXH2HMox4VUZ7x7fF65MRwuBBmw%3D%3D

    HttpUtility.UrlEncode(base64str) in .NET, or encodeURIComponent(base64str) in javascript

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