4859f6a416
This CL makes NewRequest set Body nil for known-zero bodies, and makes the http1 Transport not peek-Read a byte to determine whether there's a body. Background: Many fields of the Request struct have different meanings for whether they're outgoing (via the Transport) or incoming (via the Server). For outgoing requests, ContentLength and Body are documented as: // Body is the request's body. // // For client requests a nil body means the request has no // body, such as a GET request. The HTTP Client's Transport // is responsible for calling the Close method. Body io.ReadCloser // ContentLength records the length of the associated content. // The value -1 indicates that the length is unknown. // Values >= 0 indicate that the given number of bytes may // be read from Body. // For client requests, a value of 0 with a non-nil Body is // also treated as unknown. ContentLength int64 Because of the ambiguity of what ContentLength==0 means, the http1 and http2 Transports previously Read the first byte of a non-nil Body when the ContentLength was 0 to determine whether there was an actual body (with a non-zero length) and ContentLength just wasn't populated, or it was actually empty. That byte-sniff has been problematic and gross (see #17480, #17071) and was removed for http2 in a previous commit. That means, however, that users doing: req, _ := http.NewRequest("POST", url, strings.NewReader("")) ... would not send a Content-Length header in their http2 request, because the size of the reader (even though it was known, being one of the three common recognized types from NewRequest) was zero, and so the HTTP Transport thought it was simply unset. To signal explicitly-zero vs unset-zero, this CL changes NewRequest to signal explicitly-zero by setting the Body to nil, instead of the strings.NewReader("") or other zero-byte reader. This CL also removes the byte sniff from the http1 Transport, like https://golang.org/cl/31326 did for http2. Updates #17480 Updates #17071 Change-Id: I329f02f124659bf7d8bc01e2c9951ebdd236b52a Reviewed-on: https://go-review.googlesource.com/31445 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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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.
For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
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--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this file). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install-source.html). You should also add the Go binary directory $GOROOT/bin to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See https://golang.org/doc/install or doc/install.html for more details.