I have encountered a issue with web design that appears to be part of the http specification.
Perhaps a new section between 7 & 8 as follows;
The "ECMA" request header field is a number or text that
indicates the client's current ECMA implementation version. A blank ECMA
hint would indicate that ECMA script is currently turned off.
ECMA = Text [32 ASCII characters]
If ECMA occurs in a message more than once, the last value
should be used to override other occurrences.
#1 ECMA script is turned off
#2 ECMA script is on the Next version
#3 ECMA script is on version 5.1
i.e. profile these pages in Chrome and check the speed and cacheing;