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json_encode & header() problem

I have a function that handles an ajax/json request and responds with a string containing html. It contains the following code.

header('Content-Type: application/json');
echo json_encode($response); //send the response to the caller

When I the ajax call is made a "Opening validateAdd" dialog box opens up where validateAdd is the name of the ajax handler. I have worked with json before but have not seen this problem. Any ideas?

If I remove the header line the ajax json request completes but with an error as the header shows plain text and the ajax code expected json.

I also tried the following with the same result ...


This dialog box that pops up happens with both windows and mac browsers.

Do you have code that executes below your echo json_encode() that is perhaps outputting something or setting another header? try putting "exit();" immediately after you echo the json out.

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