storj.io/minio@v0.0.0-20230509071714-0cbc90f649b1/cmd/http/close.go (about)

     1  /*
     2   * MinIO Cloud Storage, (C) 2019 MinIO, Inc.
     3   *
     4   * Licensed under the Apache License, Version 2.0 (the "License");
     5   * you may not use this file except in compliance with the License.
     6   * You may obtain a copy of the License at
     7   *
     8   *     http://www.apache.org/licenses/LICENSE-2.0
     9   *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS,
    12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13   * See the License for the specific language governing permissions and
    14   * limitations under the License.
    15   */
    16  
    17  package http
    18  
    19  import (
    20  	"io"
    21  	"io/ioutil"
    22  )
    23  
    24  // DrainBody close non nil response with any response Body.
    25  // convenient wrapper to drain any remaining data on response body.
    26  //
    27  // Subsequently this allows golang http RoundTripper
    28  // to re-use the same connection for future requests.
    29  func DrainBody(respBody io.ReadCloser) {
    30  	// Callers should close resp.Body when done reading from it.
    31  	// If resp.Body is not closed, the Client's underlying RoundTripper
    32  	// (typically Transport) may not be able to re-use a persistent TCP
    33  	// connection to the server for a subsequent "keep-alive" request.
    34  	if respBody != nil {
    35  		// Drain any remaining Body and then close the connection.
    36  		// Without this closing connection would disallow re-using
    37  		// the same connection for future uses.
    38  		//  - http://stackoverflow.com/a/17961593/4465767
    39  		defer respBody.Close()
    40  		io.Copy(ioutil.Discard, respBody)
    41  	}
    42  }