rem: return fieldName.toLowerCase(); 
add: for (var i = 0, sz = fieldName.length; i < sz; i++) { if (!IS_TOKEN_ARRAY[fieldName.charCodeAt(i)]) { dumpn(fieldName + " is not a valid header field name!"); throw Cr.NS_ERROR_INVALID_ARG; } }  return fieldName.toLowerCase(); 
context:   normalizeFieldName: function(fieldName)  {     for (var i = 0, sz = fieldName.length; i < sz; i++)     {       if (!IS_TOKEN_ARRAY[fieldName.charCodeAt(i)])       {         dumpn(fieldName + " is not a valid header field name!");         throw Cr.NS_ERROR_INVALID_ARG;       }     }     return fieldName.toLowerCase();  },
meta: 10520	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/10520/b3a1a00072563452da570395cae09604f9088770/httpd.js/buggy/netwerk/test/httpserver/httpd.js