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flush.go
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flush.go
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// Copyright 2023 Sauce Labs Inc. All rights reserved.
//
// Copyright 2015 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package martian
import (
"bufio"
"mime"
"net/http"
)
func shouldFlush(res *http.Response) bool {
if res.Request.Method == "HEAD" {
return false
}
if res.StatusCode == http.StatusNoContent || res.StatusCode == http.StatusNotModified {
return false
}
return isTextEventStream(res) || res.ContentLength == -1
}
func isTextEventStream(res *http.Response) bool {
// The MIME type is defined in https://www.w3.org/TR/eventsource/#text-event-stream
resCT := res.Header.Get("Content-Type")
baseCT, _, _ := mime.ParseMediaType(resCT)
return baseCT == "text/event-stream"
}
// flushAfterChunkWriter works with net/http/internal.chunkedWriter and forces a flush after each chunk is written.
// There is also net/http/internal.FlushAfterChunkWriter that does the same thing nicer, but it is not available.
type flushAfterChunkWriter struct {
*bufio.Writer
}
func (w flushAfterChunkWriter) WriteString(s string) (n int, err error) {
n, err = w.Writer.WriteString(s)
if s == "\r\n" && err == nil {
err = w.Flush()
}
return
}