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net/http: verify RoundTripper invariants in the send function

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Issue #37598 reports a nil-panic in *Client.send that can
only occur if one of the RoundTripper invariants is violated.
Unfortunately, that condition is currently difficult to diagnose: it
manifests as a panic during a Response field access, rather than
something the user can easily associate with an specific erroneous
RoundTripper implementation.

No test because the new code paths are supposed to be unreachable.

Updates #37598

Change-Id: If0451e9c6431f6fab7137de43727297a80def05b
Reviewed-on: https://go-review.googlesource.com/c/go/+/221818
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Bryan C. Mills 2020-03-02 10:16:39 -05:00
parent acac535c3c
commit 12d02e7d8e
1 changed files with 6 additions and 0 deletions
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6
src/net/http/client.go
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@ -265,6 +265,12 @@ func send(ireq *Request, rt RoundTripper, deadline time.Time) (resp *Response, d
}
return nil, didTimeout, err
}
if resp == nil {
return nil, didTimeout, fmt.Errorf("http: RoundTripper implementation (%T) returned a nil *Response with a nil error", rt)
}
if resp.Body == nil {
return nil, didTimeout, fmt.Errorf("http: RoundTripper implementation (%T) returned a *Response with a nil Body", rt)
}
if !deadline.IsZero() {
resp.Body = &cancelTimerBody{
stop: stopTimer,