Thanks for the report, Björn! This is indeed a bug in the implementation of http://pubsubhubbub.appspot.com/. Working on a fix...
Roman. On Fri, Mar 8, 2013 at 5:19 PM, Björn Danielsson < [email protected]> wrote: > I am new to pubsubhubbub. I just tried subscribing to a Google Alerts > feed, and found that the callback requests contain multiple instances of > the Content-Type header. The POST headers look like this: > > Content-Type: application/atom+xml > Link: <http://pubsubhubbub.appspot.com/>; rel="hub" > X-Appengine-Country: ZZ > Content-Type: application/atom+xml > Host: xxx > Content-Length: 55287 > Accept-Encoding: gzip > > This is explicitly disallowed in RFC 2616 (section 4.2, last paragraph). > The problem will not be noticed if the server simply discards the extra > Content-type header, but in some circumstances the result is delivery > failure. I am using the Apache httpd proxy_ajp module as a frontend to > Apache TomEE where a JAX-RS application routes POST requests depending on > their content-type. It turns out that proxy_ajp collapses multiple > instances of the same HTTP header into a single instance with a > comma-separated list of values, which RFC 2616 says is semantically > equivalent for those headers that are allowed to have lists as values. So > what the application sees is: > > Content-Type: application/atom+xml, application/atom+xml > > This value does not match any known content-type, and the request fails. > > This is obviously a bug in proxy_ajp also, it shouldn't treat Content-Type > headers like this. But the primary cause of the problem is the > non-conforming nature of the original POSTs, so I am reporting it here > first. > > Thanks in advance for any replies & comments on this. > > -- > > --- > You received this message because you are subscribed to the Google Groups > "Pubsubhubbub" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- --- You received this message because you are subscribed to the Google Groups "Pubsubhubbub" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
