HTTP 1.1 says the following:

1.  Client (with web browser) sends GET request to server.
2.  Server responds with something like:
Content-type: text/html
Content-size:...blah...blah...blah....
3.  Server sends the web page.

The header is sent on #2.  What is happening is that somewhere in the
code you are outputting the HTML.  So PHP reads:

1.  Client (with web browser) sends GET request to server.
2.  Server responds with something like:
Content-type: text/html
Content-size:...blah...blah...blah....
3.  Server sends the web page.
4.  Server responds with something like:
Redirect (or whatever it is)
Content-type: text/html
Content-size:...blah...blah...blah....

But because step 2 (which is also step 4) can only happen once, PHP
outputs an error.  You need to locate the snippet of code outputting
anything first, and disable it.

Of course, I will not get into whether or not hiding headers from the
user is a good idea.  (In some forms of CGI scripting you would actually
have to type:

print "Content-type: text/html\n\n"

before doing anything else.)  

-Dan

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