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  • Mashrur Mia thinks this is interesting:

One word of warning: if the parameter information came in as encoded POST data, it will not be available if the POST data has already been read manually using the getReader( ) or getInputStream( ) method of ServletRequest (because POST data can be read only once).

From

Cover of Java Servlet Programming, 2nd Edition

Note

from POSTMan this can be tested out with URLENCODED form data