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// 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 httputil
import (
"io"
"net/http"
"net/url"
"golang.org/x/net/context"
)
// Create an HTTP request with the supplied information. bodyLength must be the
// total amount of data that will be returned by body, or -1 if unknown.
//
// Unlike http.NewRequest:
//
// * This function configures the request to be cancelled when the supplied
// context is.
//
// * This function doesn't mangle the supplied URL by round tripping it to a
// string. For example, the Opaque field will continue to differentiate
// between actual slashes in the path and escaped ones
// (https://tinyurl.com/3e3kxd6p).
//
// * This function contains less magic: it insists on an io.ReadCloser as in
// http.Request.Body, and doesn't attempt to imperfectly sniff content
// length.
//
// * This function provides a convenient choke point to ensure we don't
// forget to set a user agent header.
//
func NewRequest(
ctx context.Context,
method string,
url *url.URL,
body io.ReadCloser,
bodyLength int64,
userAgent string) (req *http.Request, err error) {
// Create the request.
req = &http.Request{
Method: method,
URL: url,
Proto: "HTTP/1.1",
ProtoMajor: 1,
ProtoMinor: 1,
Header: make(http.Header),
Body: body,
ContentLength: bodyLength,
Host: url.Host,
Cancel: ctx.Done(),
}
// Set the User-Agent header.
req.Header.Set("User-Agent", userAgent)
return
}
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