How to judge whether content type is truly "text/html"?

I know that HttpWebRequest.GetResponse() generates a HttpWebResonse.
The response has one ContentType property. But the property is just
decided by http response header. It is possible that the content is
actually HTML, while the ContentType is "image/jpeg".

Is there any effective way to judge whether the response type is truly
"text"?
I have a idea to read the first several bytes of the response stream;
and check whether they are real displayable characters. But, they can
be any kind of Encoding. Should I try all kinds of Encoding?

.

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