Weird Bug

Hey!
I'm running into a thing that I think is a bug.
When a I run a request to my worker hosted in CF my service works correctly but when I try to do it in localhost I get the following error and in html
<html>

<head>
    <title>400 Bad Request</title>
</head>

<body>
    <center>
        <h1>400 Bad Request</h1>
    </center>
    <hr>
    <center>cloudflare</center>
</body>

</html>
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