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httpclient.go
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httpclient.go
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// Copyright 2024 Tomas Machalek <tomas.machalek@gmail.com>
// Copyright 2024 Institute of the Czech National Corpus,
// Faculty of Arts, Charles University
//
// 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 httpclient
import (
"crypto/tls"
"net/http"
"time"
)
const (
TransportMaxIdleConns = 100
TransportMaxConnsPerHost = 100
TransportMaxIdleConnsPerHost = 80
)
type httpClientConf struct {
followRedirects bool
idleConnTimeout time.Duration
timeout time.Duration
tslSkipVerify bool
}
func WithFollowRedirects() func(args *httpClientConf) {
return func(args *httpClientConf) {
args.followRedirects = true
}
}
// WithTimeout specifies request timeout (incl. connecting, redirects,
// body reading).
func WithTimeout(value time.Duration) func(args *httpClientConf) {
return func(args *httpClientConf) {
args.timeout = value
}
}
// WithIdleConnTimeout specifies the maximum amount of time an idle
// (keep-alive) connection will remain idle before closing
// itself. To set no limit, use zero.
func WithIdleConnTimeout(value time.Duration) func(args *httpClientConf) {
return func(args *httpClientConf) {
args.idleConnTimeout = value
}
}
// WithInsecureSkipVerify disables certificate verification.
// Please note that this is intended for internal network
// usage due to possible security implications.
func WithInsecureSkipVerify() func(args *httpClientConf) {
return func(args *httpClientConf) {
args.tslSkipVerify = true
}
}
func New(options ...func(args *httpClientConf)) *http.Client {
var conf httpClientConf
for _, opt := range options {
opt(&conf)
}
transport := http.DefaultTransport.(*http.Transport).Clone()
transport.MaxIdleConns = TransportMaxIdleConns
transport.MaxConnsPerHost = TransportMaxConnsPerHost
transport.MaxIdleConnsPerHost = TransportMaxIdleConnsPerHost
transport.IdleConnTimeout = conf.idleConnTimeout
if conf.tslSkipVerify {
transport.TLSClientConfig = &tls.Config{
InsecureSkipVerify: true,
}
}
client := http.Client{
Timeout: conf.timeout,
Transport: transport,
}
if conf.followRedirects {
client.CheckRedirect = func(req *http.Request, via []*http.Request) error {
return http.ErrUseLastResponse
}
}
return &client
}