net/http: something about 100-continue

[gzw13999]

If client http header contain Expect: 100-continue

client post multipart/form-data Sometimes there will be
"multipart: Part Read: WSARecv tcp ..138.250:80: i/o timeout" ParseMultipartForm(102400) -> /mime/multipart/multipart.go 239
This is immediately returned error.
Did not arrive ReadTimeout

The same service, the same machine, open the IIS running do not have this problem.

[adg]

I'm having trouble understanding your problem. Can you rephrase?

[rsc]

Duplicate of #3665?
Brad, if so, and you don't want to fix this now, change to milestone Unplanned.

[anacrolix]

I think this is a duplicate. Any use of Expect: 100-continue in client code is currently not going to work the way expected and OP calls this out immediately.

[bradfitz]

Closing as duplicate of #3665