Hello, I am working on a Valve that does some integrity checking on HTTP requests (the details aren't important) where I need this valve to have access to the HTTP request body as well. I used request.getInputStream to fetch the data. However when a web application makes use of my valve, the getParameter method does not return the parameters submitted via POST anymore. This is documented behavior according to the spec of ServletRequest ( https://tomcat.apache.org/tomcat-8.0-doc/servletapi/javax/servlet/ServletRequest.html#getInputStream() ).
I was wondering why it was designed this way, since numerous complaints have arisen from this behavior and some ugly workarounds have been devised which unfortunately stop working from Tomcat 7 (servlet 3.0): https://stackoverflow.com/questions/10210645/http-servlet-request-lose-params-from-post-body-after-read-it-once This shows how easily code like this could break. Overwriting getInputStream to return a cached version doesn't work anymore since the parameter attribute isn't populated by using getInputStream. How exactly it is populated remains a mystery to me. Any advice on how to solve this properly? Performing an integrity check without getInputStream or getReader but with getParameters, will not work if the data submitted is not in the expected format. Kind regards, Roel Storms
