http: optimize checkIsHttpToken for short strings

Use lookup table instead of regex for strings shorter than 10
characters to improve performance for common short header names
while maintaining compatibility.
PR-URL: #59832
Reviewed-By: Ethan Arrowood <ethan@arrowood.dev>
Reviewed-By: Tim Perry <pimterry@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

Author: JinhyeokFang

lib/_http_common.js

@@ -24,6 +24,7 @@
 const{
  MathMin,
  Symbol,
+ Uint8Array,
 }=primordials;
 const{ setImmediate }=require('timers');
 
@@ -205,14 +206,49 @@ function freeParser(parser, req, socket) {
 }
 }
 
+// Character code ranges for valid HTTP tokens
+// Valid chars: ^_`a-zA-Z-0-9!#$%&'*+.|~
+// Based on RFC 7230 Section 3.2.6 token definition
+// See https://tools.ietf.org/html/rfc7230#section-3.2.6
 consttokenRegExp=/^[\^_`a-zA-Z\-0-9!#$%&'*+.|~]+$/;
+constvalidTokenChars=newUint8Array([
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 0-15
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 16-31
+0,1,0,1,1,1,1,1,0,0,1,1,0,1,1,0,// 32-47 (!"#$%&'()*+,-./)
+1,1,1,1,1,1,1,1,1,1,0,0,0,0,0,0,// 48-63 (0-9:;<=>?)
+0,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,// 64-79 (@A-O)
+1,1,1,1,1,1,1,1,1,1,1,0,0,0,1,1,// 80-95 (P-Z[\]^_)
+1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,// 96-111 (`a-o)
+1,1,1,1,1,1,1,1,1,1,1,0,1,0,1,0,// 112-127 (p-z{|}~)
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 128-143
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 144-159
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 160-175
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 176-191
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 192-207
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 208-223
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 224-239
+0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,// 240-255
+]);
+
 /**
  * Verifies that the given val is a valid HTTP token
  * per the rules defined in RFC 7230
  * See https://tools.ietf.org/html/rfc7230#section-3.2.6
  */
 functioncheckIsHttpToken(val){
-returntokenRegExp.test(val);
+if(val.length>=10){
+returntokenRegExp.test(val);
+}
+
+if(val.length===0)returnfalse;
+
+// Use lookup table for short strings, regex for longer ones
+for(leti=0;i<val.length;i++){
+if(!validTokenChars[val.charCodeAt(i)]){
+returnfalse;
+}
+}
+returntrue;
 }
 
 constheaderCharRegex=/[^\t\x20-\x7e\x80-\xff]/;