The problem is in HttpRequest >> #rawPostFields

I have tested the following modification:

HttpRequest>>#rawPostFields
    ^self propertyAt: #rawPostFields ifAbsentPut: [
        (self isPostRequest) ifTrue: [
            stream next: self contentLength
        ] ifFalse: [
            ''
        ].
    ] 

It seems ok.

Name: KomHttpServerLight-pmm.7
Author: pmm
Time: 13 April 2011, 11:15:01 pm
UUID: 540eee5a-7312-45a2-9fb6-f70e0ac9c951
Ancestors: KomHttpServerLight-pmm.6

- Issue 648:    WARequest >> #rawBody is empty
- http://code.google.com/p/seaside/issues/detail?id=648

Name: KomHttpServer-pmm.65
Author: pmm
Time: 13 April 2011, 11:18:19 pm
UUID: 7532dedf-6bf2-4e70-8c3c-9b5ed5011434
Ancestors: KomHttpServer-pmm.64

- Issue 648:    WARequest >> #rawBody is empty
- http://code.google.com/p/seaside/issues/detail?id=648

KomHttpServerLight-pmm.7 breaks multipart uploads (reproducible in 
http://localhost:8080/tests/functional/WAInputPostMultipartFunctionalTest). 
Reverted to KomHttpServerLight-pmm.6.

Wow, good catch, I should have caught this. So interestingly enough the 
multipart decoding in Kom does not use #rawPostFields but instead reads 
directly from the socket. If two methods both want to read the same data from 
the socket, one of them is going to lose.

The original code assumed that there are only two kinds of POSTs, multipart and 
urlencoded. So it checked for content type being urlencoded instead of it being 
not multipart.

With this fix #rawBody is still empty for multipart POSTs which I guess we can 
live with.

Name: KomHttpServerLight-pmm.8
Author: pmm
Time: 22 April 2011, 11:00:33 pm
UUID: 08d0af0c-d1a0-4d59-8f79-1489553f821d
Ancestors: KomHttpServerLight-pmm.7

- http://code.google.com/p/seaside/issues/detail?id=648

Name: KomHttpServer-pmm.66
Author: pmm
Time: 22 April 2011, 11:07:29 pm
UUID: 0e6cc59c-e43a-4b64-883e-5fcf274c2841
Ancestors: KomHttpServer-pmm.65

- http://code.google.com/p/seaside/issues/detail?id=648
- Issue 648:    WARequest >> #rawBody is empty 
- fix multipart posts
- Issue 648:    WARequest >> #rawBody is empty 
- fix multipart posts