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net/http: set Content-Length:0 for empty PATCH requests as with POST, PATCH

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Sets Content-Length:0 for nil bodies in PATCH requests, as we already do for  POST and PUT requests.

RFC 2616 mentions that unless a method’s Content-Length is forbidden it can send one.
In the wild, we’ve found that Microsoft Azure’s DataLake Gen2 storage API https://docs.microsoft.com/en-us/rest/api/storageservices/datalakestoragegen2/path/update deliberately rejects PATCH requests without a Content-Length, yet there is no workaround for setting that header when trying to flush the content of a file which was uploaded in a previous request.

Fixes #40978

Change-Id: Ib0a623b907d827a1c5ee431dca3c41024fa291c5
GitHub-Last-Rev: 12a3903f2b
GitHub-Pull-Request: golang/go#40991
Reviewed-on: https://go-review.googlesource.com/c/go/+/250039
Run-TryBot: Emmanuel Odeke <emm.odeke@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>
This commit is contained in:
Segflow 2020-08-24 13:42:45 +00:00 committed by Emmanuel Odeke
parent 494ec85d9f
commit fb5c3eabd1
2 changed files with 21 additions and 1 deletions
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20
src/net/http/requestwrite_test.go
View File

@ -588,6 +588,26 @@ var reqWriteTests = []reqWriteTest{
},
WantError: errors.New("net/http: can't write control character in Request.URL"),
},
26: { // Request with nil body and PATCH method. Issue #40978
Req: Request{
Method: "PATCH",
URL: mustParseURL("/"),
Host: "example.com",
ProtoMajor: 1,
ProtoMinor: 1,
ContentLength: 0, // as if unset by user
},
Body: nil,
WantWrite: "PATCH / HTTP/1.1\r\n" +
"Host: example.com\r\n" +
"User-Agent: Go-http-client/1.1\r\n" +
"Content-Length: 0\r\n\r\n",
WantProxy: "PATCH / HTTP/1.1\r\n" +
"Host: example.com\r\n" +
"User-Agent: Go-http-client/1.1\r\n" +
"Content-Length: 0\r\n\r\n",
},
}
func TestRequestWrite(t *testing.T) {

2
src/net/http/transfer.go
View File

@ -258,7 +258,7 @@ func (t *transferWriter) shouldSendContentLength() bool {
return false
}
// Many servers expect a Content-Length for these methods
if t.Method == "POST" || t.Method == "PUT" {
if t.Method == "POST" || t.Method == "PUT" || t.Method == "PATCH" {
return true
}
if t.ContentLength == 0 && isIdentity(t.TransferEncoding) {