https://issues.apache.org/bugzilla/show_bug.cgi?id=52577
Bug #: 52577
Summary: Response output written in filter can be truncated
Product: Tomcat 7
Version: 7.0.25
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
AssignedTo: dev@tomcat.apache.org
ReportedBy: dmitry.neve...@gmail.com
Classification: Unclassified
Due to changes 1229726, 1229727 and 1229728 output written to response in the
filter can be truncated up to 8192 bytes. Consider the following scenario:
- you have a filter that invoke getWriter() before chain.doFilter(request,
responseWrapper)
- responseWrapper overrides getWriter() method and returns some
buffered writer, not the real one
- during execution of chain.doFilter there is a forward
Before the forward ApplicationDispather calls resetBuffer on response, which in
turn calls reset() on OutputBuffer, which sets gotEnc field to false. This
field is initialized in the setConverter() method which is called from
response.getWriter(), but since our wrapperResponse overrides getWriter(),
OutputBuffer.setConverter() never called and OutputBuffer still has gotEnc =
false.
Response's close() and flushBuffer() methods call OutputBuffer's flush(), but
since gotEnc == false, conv.flushBuffer() is not called:
if (gotEnc && conv != null) {
conv.flushBuffer();
}
A workaround for us is to implement getWriter() method in responseWrapper like
this:
public Writer getWriter() {
Writer originalWriter = originalResponse.getWriter();//save for future
processing
return ourWriter;
}
Maybe you should change flushing to something like that:
if (conv != null) {
conv.flushBuffer();
}
because you invoke conv.convert() without any checks in the write*() methods
and it seems like conv is never null.
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