Problem with link from validator page

Hello:

I attempted to access the page for valid HTML as per the following and 
it failed with the message as below.
--------------
W3C CSS Validator Results for file://localhost/TextArea

To work as intended, your CSS style sheet needs a correct document parse 
tree. This means you should use valid HTML.
Errors

Using your link "valid HTML" as underlined above gets me this message

Bad Request
Your browser sent a request that this server could not understand.

Size of a request header field exceeds server limit.

-- 
Hugh Petrie

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