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5f5a55679c
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Paul Forgey 5f5a55679c net/http: refactor ResponseWriter.ReadFrom to permit splice on Linux 
Rather than probe and guess if sendfile will work inside ResponseWriter.ReadFrom(src),
this change fixes the underlying issue of starting to respond before src is readable
We'll no longer send a status OK if a header has not yet been written and reading
from src is destined to fail. This small change implicitly takes care of the need for
the server to sniff the response body to determine the Content-Type.

This allows splice to work on Linux when src is a socket or any non-regular file that's spliceable.

The extra read of 512 bytes may raise an objection, and that's fair, but
we're already swapping some syscall prep work for another and a read of
512 probably will not impact the overall performance. For shorter
bodies, there's likely less setup time. A little initial slop is not too
unusual in zero copy network code, and sometimes actually helps.

Fixes #40888

Change-Id: I4a8e2ad0ace1318bae66dae5671d06ea6d4838ed
GitHub-Last-Rev: 097364ea86
GitHub-Pull-Request: golang/go#40903
Reviewed-on: https://go-review.googlesource.com/c/go/+/249238
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
2020-09-01 00:55:12 +00:00
.github
api text/template: add CommentNode to template parse tree 2020-08-28 21:45:12 +00:00
doc text/template: add CommentNode to template parse tree 2020-08-28 21:45:12 +00:00
lib/time lib/time, time/tzdata: update tz data to 2020a 2020-04-30 08:07:39 +00:00
misc misc/wasm: make wasm_exec more robust against uncommon environments 2020-08-25 21:15:43 +00:00
src net/http: refactor ResponseWriter.ReadFrom to permit splice on Linux 2020-09-01 00:55:12 +00:00
test cmd/compile,runtime: skip zero'ing order array for select statements 2020-08-29 08:02:52 +00:00
.gitattributes all: treat all files as binary, but check in .bat with CRLF 2020-06-08 15:31:43 +00:00
.gitignore
AUTHORS A+C: add Kush Patel (corporate CLA for Hootsuite Inc) 2020-07-08 00:10:44 +00:00
CONTRIBUTING.md
CONTRIBUTORS CONTRIBUTORS: update for the Go 1.15 release 2020-08-10 21:51:48 +00:00
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README.md

The Go Programming Language

Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.

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