javascript - What problems may using the MIME type application/json cause? -

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i working on web service needs return json data. i read should use application/json not sure problems may cause?

for example, older browsers support it? (ie6+, ff, opera, etc.)

or possible users behind corporate firewalls/proxy servers block mime type application/json?

what, if any, problems have had following advice?

let's consider ie. have hidden iframe use request file download. example

<iframe src="getfile?id=123">

now, server may send json-encoded error message like

{     error: 'file 123 not exist',     retrylater: false }

if error message sent application/json, download dialog appear, because json text mistaken actual file.

on other hand, mime type of text/plain cause message rendered in iframe, , can extract it, , transform fancy pop-up or using jscript.

(edit)

real-world example: extjs fileupload - problem ie8 security bar


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