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req.is()
Returns true if this request's declared "Content-Type" matches the specified media/mime type.
Specifically, this method matches the given type against this request's "Content-Type" header.
Usage
req.is(type);
Example
Assuming the request contains a "Content-Type" header, "text/html; charset=utf-8":
req.is('html');
// -> true
req.is('text/html');
// -> true
req.is('text/*');
// -> true
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Reference
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