39 lines
923 B
Go
39 lines
923 B
Go
package service
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import (
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"net/http"
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"golang.org/x/net/http/httpguts"
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"golang.org/x/net/http2"
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)
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func newSmartRoundTripper(transport *http.Transport) (http.RoundTripper, error) {
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transportHTTP1 := transport.Clone()
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err := http2.ConfigureTransport(transport)
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if err != nil {
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return nil, err
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}
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return &smartRoundTripper{
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http2: transport,
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http: transportHTTP1,
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}, nil
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}
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type smartRoundTripper struct {
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http2 *http.Transport
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http *http.Transport
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}
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// smartRoundTripper implements RoundTrip while making sure that HTTP/2 is not used
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// with protocols that start with a Connection Upgrade, such as SPDY or Websocket.
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func (m *smartRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) {
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// If we have a connection upgrade, we don't use HTTP/2
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if httpguts.HeaderValuesContainsToken(req.Header["Connection"], "Upgrade") {
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return m.http.RoundTrip(req)
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}
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return m.http2.RoundTrip(req)
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}
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