Hi, I was recently updating squid from version v3.0.STABLE23 to 3.1.15 and noticed, that the handling of PUT-requests with "Expect: 100-continue" header changed. While with version v3.0.STABLE23 the proxy wrote to the log file 1316481430.883 2303 192.168.0.1 TCP_MISS/200 314 PUT http://www.example.com/services/submit.php? - DIRECT/192.0.2.1 text/html what triggered the client to send a request shortly after: 1316481432.180 1294 192.168.0.1 TCP_MISS/200 314 PUT http://www.example.com/services/submit.php? - DIRECT/192.0.2.1 text/html Which look to me that the proxy has forwarded at least something to the origin server. I don't know if it really reported a 200 to the client which sounds strange for a PUT-request having a "Expect: 100-continue". Probably the client (using libcurl 7.16.1) just reached a timeout and issued another PUT-request without the Expect-header and with a body. Using version 3.1.15 the proxy wrote to the log file 1317091304.706 0 192.168.0.1 NONE/417 6181 PUT http://www.example.com/services/submit.php? - NONE/- text/html No other request comes hereafter. The client user reports the application says "Error 417". It seems the client does not repeat the POST-request without "expectations". On the other hand squid seems not to ask the origin server which is HTTP/1.1 aware and sends a 417 on it own, which at least for a HTTP/1.1 proxy would be wrong. Or am I missing something? Can I do something about it? Is setting "ignore_expect_100 on" the right thing and without side-effects? Thanks, Jan -- Jan Sievers | Freie Universität Berlin | sievers@xxxxxxxxxxxxxxxxxx Zentraleinrichtung für Datenverarbeitung | http://www.zedat.fu-berlin.de