I'm currently developing a web service that needs to return JSON data. After doing some research, I found recommendations to use application/json. However, I am concerned about potential issues this may cause.
Will older browsers like IE6+, Firefox, and Opera support this content type?
Could users behind corporate firewalls or proxy servers potentially block the mime type application/json?
If you have followed this advice before, what problems, if any, did you encounter?
Consider the situation in Internet Explorer. Imagine having a hidden iFrame used to request a file download. For instance
<iframe src="getFile?id=123">
The server might send a JSON-encoded error message like this
{
error: 'File 123 does not exist',
retryLater: false
}
If the error message is sent as application/json, it can trigger a download dialog because the JSON data is mistaken for the actual file.
On the flip side, using a MIME type of text/plain will display the message within the iFrame. You can then extract and transform it into something more visually appealing using JavaScript.
(Edit)
Here's a real-life example: EXTJS Fileupload - Problem with IE8 security bar
This topic has already been covered in previous conversations:
What constitutes the proper JSON content type?
If there are any firewalls obstructing the MIME type, it may lead to complications with AJAX web applications; however, this should not be a major cause for concern.
After a frustrating battle with IE8 myself, I discovered that when loading JSON into an iframe as text/plain, IE8 will wrap it in a pre tag. This caused issues when trying to parse the content as JSON using innerHTML.
To resolve this issue, I had to send the content as text/html, which felt counterintuitive but turned out to be the workaround that worked for IE without causing issues in more modern browsers with AJAX handling.
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