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control/controlhttp/controlhttpserver: split out Accept to its own package

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Otherwise all the clients only using control/controlhttp for the
ts2021 HTTP client were also pulling in WebSocket libraries, as the
server side always needs to speak websockets, but only GOOS=js clients
speak it.

This doesn't yet totally remove the websocket dependency on Linux because
Linux has a envknob opt-in to act like GOOS=js for manual testing and force
the use of WebSockets for DERP only (not control). We can put that behind
a build tag in a future change to eliminate the dep on all GOOSes.

Updates #1278

Change-Id: I4f60508f4cad52bf8c8943c8851ecee506b7ebc9
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-11-07 15:59:19 -08:00
committed by Brad Fitzpatrick
parent 23880eb5b0
commit c3306bfd15
10 changed files with 68 additions and 42 deletions
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9
control/controlhttp/client.go
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@@ -38,6 +38,7 @@ import (
"time"
"tailscale.com/control/controlbase"
"tailscale.com/control/controlhttp/controlhttpcommon"
"tailscale.com/envknob"
"tailscale.com/health"
"tailscale.com/net/dnscache"
@@ -571,9 +572,9 @@ func (a *Dialer) tryURLUpgrade(ctx context.Context, u *url.URL, optAddr netip.Ad
Method: "POST",
URL: u,
Header: http.Header{
"Upgrade": []string{upgradeHeaderValue},
"Connection": []string{"upgrade"},
handshakeHeaderName: []string{base64.StdEncoding.EncodeToString(init)},
"Upgrade": []string{controlhttpcommon.UpgradeHeaderValue},
"Connection": []string{"upgrade"},
controlhttpcommon.HandshakeHeaderName: []string{base64.StdEncoding.EncodeToString(init)},
},
}
req = req.WithContext(ctx)
@@ -597,7 +598,7 @@ func (a *Dialer) tryURLUpgrade(ctx context.Context, u *url.URL, optAddr netip.Ad
return nil, fmt.Errorf("httptrace didn't provide a connection")
}
if next := resp.Header.Get("Upgrade"); next != upgradeHeaderValue {
if next := resp.Header.Get("Upgrade"); next != controlhttpcommon.UpgradeHeaderValue {
resp.Body.Close()
return nil, fmt.Errorf("server switched to unexpected protocol %q", next)
}