The MIME header parser treated spaces and hyphens as equivalent, which can permit HTTP request smuggling.
{ "imports": [ { "path": "net/textproto", "symbols": [ "CanonicalMIMEHeaderKey", "canonicalMIMEHeaderKey" ] } ] }
"https://vuln.go.dev/ID/GO-2021-0157.json"
"https://pkg.go.dev/vuln/GO-2021-0157"