Oh! both excellent thoughts. Okay, I’ll try to remember this for the next time this happens.
Many thanks! John > On Aug 19, 2019, at 11:10, Bogdan Popa <bog...@matchacha.ro> wrote: > > The server doesn't seem to handle `Expect:' headers properly so, for > example, curl has a couple seconds' delay when you run the following > from the command line: > > $ curl -v -F'request=1234' brinckerhoff.org:8025 > > * Rebuilt URL to: brinckerhoff.org:8025/ > * Trying 45.79.98.233... > * TCP_NODELAY set > * Connected to brinckerhoff.org (45.79.98.233) port 8025 (#0) >> POST / HTTP/1.1 >> Host: brinckerhoff.org:8025 >> User-Agent: curl/7.54.0 >> Accept: */* >> Content-Length: 146 >> Expect: 100-continue >> Content-Type: multipart/form-data; >> boundary=------------------------94d1720a98a20d42 >> > * Done waiting for 100-continue > < HTTP/1.1 200 Okay > ... > > Here's the output when you disable the Expect header: > > $ curl -H'Expect:' -v -F'request=1234' brinckerhoff.org:8025 > > * Rebuilt URL to: brinckerhoff.org:8025/ > * Trying 45.79.98.233... > * TCP_NODELAY set > * Connected to brinckerhoff.org (45.79.98.233) port 8025 (#0) >> POST / HTTP/1.1 >> Host: brinckerhoff.org:8025 >> User-Agent: curl/7.54.0 >> Accept: */* >> Content-Length: 146 >> Content-Type: multipart/form-data; >> boundary=------------------------f6089861efe4775a >> > < HTTP/1.1 200 Okay > > (no delay before the response is returned) > > Maybe `post-impure-port' sends an `Expect' header on POST and tries to > handle the exchange correctly? IIRC, web browsers don't send `Expect' > headers. > > The other explanation could be related to DNS resolution. Do you run > `dnsmasq' or something like it locally? I've run into slow DNS > resolution issues myself on macOS when my resolvers were misconfigured. > These tend to lead to heisenbugs when the slow resolution eventually > resolves and gets cached so all subsequent calls are fast. -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/9a5c273b-6adf-4004-aeaa-462fa806137d%40mtasv.net.
