[hunchentoot-devel] write-sequence to *hunchentoot-stream* on x86_64

[Jeff Caldwell]

Hello,

Can anyone give me a way to debug the following problem, or tell me likely
places to investigate?

With Hunchentoot 0.11.1 I have a problem on this machine:

Linux machine-1-name 2.6.18-8.1.8.el5 #1 SMP Mon Jun 25 15:19:07 EDT 2007
x86_64 x86_64 x86_64 GNU/Linux

but I don't have that problem on this machine:

Linux machine-2-name 2.6.16.27-0.9-smp #1 SMP Tue Feb 13 09:35:18 UTC 2007
i686 i686 i386 GNU/Linux

I am running LWL Pro 4.3.7.

On the x86_64 machine, every page, even the Hunchentoot default page, has
some seemingly-random binary data that comes after the headers but before the
content. This appears in the browser as strange characters at the top of the
page, often (but not always) followed by part or all of the desired web page.
The random binary data is not in the content variable that is written to the
stream. The headers are OK, the content is OK, it is only that there is extra
binary data between the headers and the content.

I found a workaround. In headers.lisp, in function start-output, in the
following code, write-sequence is the original code in hunchentoot while
write-string is the workaround needed to get good output and avoid the
extraneous binary data between the headers and the content.

...
    (setf (flexi-stream-external-format *hunchentoot-stream*) 
          (reply-external-format))
    ;; now optional content
    (unless (or (null content) head-request-p)
      (ignore-errors
	#+x86_64RHEL5-workaround
        (write-string (coerce (loop for c across content 
                                    collect (code-char c)) 'string)          
        
                      *hunchentoot-stream*)
        #-x86_64RHEL5-workaround
        (write-sequence content *hunchentoot-stream*)))
    (when chunkedp
      ;; turn chunking on after the headers have been sent
      (setf (chunked-stream-output-chunking-p
             (flexi-stream-stream *hunchentoot-stream*)) t))
    *hunchentoot-stream*))

Again, can anyone give me tips on where to look or how to debug the problem?

Thanks,

Jeff Caldwell





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