URLConnection.guessContentTypeFromStream

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Syntax

public static String guessContentTypeFromStream( InputStream is ) throws IOException

Parameters

is: an input stream that supports marks.

Returns

a guess at the content type, or null if none can be determined.

Description

Tries to determine the type of an input stream based on the characters at the beginning of the input stream. This method can be used by subclasses that override the getContentType method.

Ideally, this routine would not be needed. But many http servers return the incorrect content type; in addition, there are many nonstandard extensions. Direct inspection of the bytes to determine the content type is often more accurate than believing the content type claimed by the http server.

Exceptions

IOException if an I/O error occurs while reading the input stream.