ability to close the response stream early

[diyism]

In nginx-lua/openresty, I can close the http response early (avoid my users waiting) and continue doing things that cost time on my server:

ngx.say("bye bye, my user")
ngx.eof()
local http=require"httpc".create()
http:request{method="GET", url="https://a web page of very long content"}
local data,err=http:read"*a"

Does the algernon web server have such an API? for example "end()":

print("bye bye, my user")
flush()
end()
hc = HTTPClient()
hc:Get("https://a web page of very long content")

[xyproto]

Thanks for reporting! I think this is a good idea.

[diyism]

Indeed, I've tested the two mini lua web servers: redbean and mako,
both of them have an async method now:
redbean: jart/cosmopolitan#615 (comment)
mako: RealTimeLogic/BAS#4 (comment)

[xyproto]

end is already a reserved keyword in Lua, but I added a close() function. It sends a Connection: close header to the connected client, flushes the body and tries to stop Lua functions from writing any more data to the client.

It is also possible to get hold of the net.Conn and then close that one, but it's a tiny bit more involved, since one has to set up a ConnContext field for all involved Server structs that are in use in Algernon.

Please test if the current functionality in the main branch is sufficient to solve this issue. Thanks.

[diyism]

Thanks for your response.
I've tested it with the following:

$ git clone --depth 1 https://github.com/xyproto/algernon/
$ cd algernon
$ go build -mod=vendor
$ sudo cp algernon /usr/local/bin/
$ mkdir www
$ cd www
$ cat sleep.lua
sleep(3)
print("welcome, my user")
$ cat index.lua
print("bye bye, my user")
close()
GET("http://127.0.0.1:3000/sleep.lua")
$ algernon

then I visit http://127.0.0.1:3000/index.lua
it still cost about 3 seconds to show "bye bye, my user"
it seems there is a problem somewhere.

[xyproto]

Thanks for testing! I'll add code to close the actual connection.