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https://issues.apache.org/jira/browse/SOLR-2878?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13144687#comment-13144687
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Uwe Schindler commented on SOLR-2878:
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Your class still ignores the charset, you simply have to pass it everywhere
(when creating writers, when creating strings,...). Also you are still mixing
bytes with characters (out.write should take the bytes, not the string). If you
are simply calculating a hash of the response, why not remove the string
handling at all? Hashing is always done on bytes so all transformations between
strings and bytes are useless and slowdowns all and itroduces bugs. A filter
that simply hashes the output takes buffers the response bytes (using
ByteArrayOutputStream), then calculates the hash using MessageDigest (it can
also do this during writing), writes the hash as header and finally copies the
buffered bytes to the output stream. Why transform from/to strings everywhere?
This code is so chaotic and violates character encodings at lots of places, so
I refuse to correct it. Ask somebody who understands your use-case. Sorry :-(
> Regression in SolrDispatchFilter.java concerning the getOutputStream vs
> getWriter
> ---------------------------------------------------------------------------------
>
> Key: SOLR-2878
> URL: https://issues.apache.org/jira/browse/SOLR-2878
> Project: Solr
> Issue Type: Bug
> Components: Build, Response Writers
> Affects Versions: 3.4
> Environment: Any unix system, it's a global problem
> Reporter: Nick Veenhof
>
> In solr 1.4 we used getWriter in the writeResponse for
> solrDispatchFilter::doFilter which invoked writeResponse.
> This code looked in summary like this :
> {code:title=solrDispatchFilter.java|borderStyle=solid}
> private void writeResponse(SolrQueryResponse solrRsp, ServletResponse
> response,
> QueryResponseWriter responseWriter, SolrQueryRequest solrReq, Method
> reqMethod)
> throws IOException {
> ...
> PrintWriter out = response.getWriter();
> responseWriter.write(out, solrReq, solrRsp);
> ...
> {code}
> In solr 3.x this has changed to something like this
> {code:title=solrDispatchFilter.java|borderStyle=solid}
> private void writeResponse(SolrQueryResponse solrRsp, ServletResponse
> response,
> QueryResponseWriter responseWriter, SolrQueryRequest solrReq, Method
> reqMethod)
> throws IOException {
> ...
> String charset = ContentStreamBase.getCharsetFromContentType(ct);
> Writer out = (charset == null || charset.equalsIgnoreCase("UTF-8"))
> ? new OutputStreamWriter(response.getOutputStream(), UTF8)
> : new OutputStreamWriter(response.getOutputStream(), charset);
> out = new FastWriter(out);
> responseWriter.write(out, solrReq, solrRsp);
> out.flush();
> ...
> {code}
> Now, when we add another filter that tries to modify the output it is being
> blocked by the out.flush().
> flush() is telling our outputstream that it can write directly to the
> destination (similar to the out.close()), since this normally happens
> automatically there shouldn't be a need to execute this flush.
> In our case this secondary filter is trying to add headers to the response
> object. When we were using getwriter() it was not closing the writer so we
> could still modify this output. Since the flush happens now we are no longer
> able to modify the headers accordingly.
> It would be an easy fix if the flush could be commented out and everything
> would work but that is not the case. The headers are working when this
> happens but there is no more output.
> When I modify both classes to use getWriter() everything is working as
> expected.
> This is a severe regression for our use of solr.
> Our code that is used in the filter
> {code:title=solrCustomFilter.java|borderStyle=solid}
> public void doFilter(ServletRequest req, ServletResponse res,FilterChain
> chain)
> throws IOException, ServletException {
> ...
> Writer out = new OutputStreamWriter(response.getOutputStream(), "UTF8");
> //auto flush
> out = new FastWriter(out);
> // convert to a chartext
> CharResponseWrapper wrapper = new CharResponseWrapper((HttpServletResponse)
> response);
> chain.doFilter(request, wrapper);
> String responseBody = wrapper.toString();
> //write the outgoing header. Only succeeds when flush of solrDispatchFilter
> is commented out
> response.addHeader("pragma", "somevalue;");
> out.write(responseBody);
> ...
> {code}
> Sources :
> {quote}
> SRV.5.5 Closure of Response Object
> When a response is closed, the container must immediately flush all remaining
> content in the response buffer to the client. The following events indicate
> that the servlet has satisfied the request and that the response object is to
> be closed:
> • The termination of the service method of the servlet.
> • The amount of content specified in the setContentLength method of the
> response has been written to the response.
> • The sendError method is called.
> • The sendRedirect method is called.
> {quote}
> Solr 1.4
> https://svn.apache.org/repos/asf/lucene/solr/branches/branch-1.4/src/webapp/src/org/apache/solr/servlet/SolrDispatchFilter.java
> Solr 3.4
> https://svn.apache.org/repos/asf/lucene/dev/branches/lucene_solr_3_4/solr/core/src/java/org/apache/solr/servlet/SolrDispatchFilter.java
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