There's text/plain if you just want to return a text document. Other file types include image/png.
The Content-type header takes a MIME type. There's a list of many of those at Wikipedia. Many of those are valid and understood as document types by popular web browsers. Some require external applications be triggered for rendering. A few of them are more appropriate to other uses such as documents being sent back to the web server or messages parsed by email clients.
There are also XMLHTTPRequest and related methods for JavaScript. If you want to just return a notification in the current page, you could return plaintext, HTML, JSON, or XML (or, indeed, other things) and update the current page using JavaScript to show the results. Libraries like jQuery make this simple.
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Are you posting in the right place? Check out Where do I post X? to know for sure.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
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Want more info? How to link
or How to display code and escape characters
are good places to start.
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