It should be specified in the Content-Type for both text/plain and text/html. 

Content-Type: text/plain; charset="us-ascii"
Content-Type: text/plain; charset=UTF-8
etc

[download]

If it's not, you have to guess.

In reply to Re: Help in finding encoding by ikegami
in thread Help in finding encoding by paramjit

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
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