fix mod_proxy_backend_http vulnerability
If the http-backend sends back an invalid response, like:
HTTP/1.1 200 OK
Of course, the chunk-length "\0" is not valid. However, lighttpd trapped into an endless loop at the monent. It cannot serve any more, and its cpu usage is up to 100%.
In this case, mod_proxy_backend_http should just stop, and return HANDLER_FINISHED.
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