How to use checkRedirect method of main Package

Best Syzkaller code snippet using main.checkRedirect

文档demo.go

Source:文档demo.go Github

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1package main2/**3https://tonybai.com/2021/04/02/go-http-client-connection-control/ 文档4最初早期的http 1.0协议只支持短连接，即客户端每发送一个请求，就要和服务器端建立一个新TCP连接，请求处理完毕后，该连接将被拆除。5显然每次tcp连接握手和拆除都将带来较大损耗，为了能充分利用已建立的连接，后来的http 1.0更新版和http 1.1支持在http请求头中加入Connection: keep-alive来告诉对方这个请求响应完成后不要关闭链接，下一次还要复用这个连接以继续传输后续请求和响应。6后HTTP协议规范明确规定了HTTP/1.0版本如果想要保持长连接，需要在请求头中加上Connection: keep-alive，而HTTP/1.1版本将支持keep-alive长连接作为默认选项，有没有这个请求头都可以。71： http包默认启用keep-alive82. http client端基于非keep-alive连接发送请求9client := http.Client{Transport: &http.Transport{DisableKeepAlives: true}}103. 支持长连接闲置超时关闭的http server114: client 类型12Client 类型代表 HTTP 客户端。它的零值（ DefaultClient ）是一个可用的使用 DefaultTransport 的客户端。13Client 的 Transport 字段一般会含有内部状态（缓存 TCP 连接），todo 因此 Client 类型值应尽量被重用而不是每次需要都创建新的。Client 类型值可以安全的被多个 go 程同时使用。14Client 类型的层次比 RoundTripper 接口（如 Transport ）高，还会管理 HTTP 的 cookie 和重定向等细节。155: 主要结构16type Client struct {17 // Transport 指定执行独立、单次 HTTP 请求的机制。18 // 如果 Transport 为 nil，则使用 DefaultTransport 。19 Transport RoundTripper20 // CheckRedirect 指定处理重定向的策略。21 // 如果 CheckRedirect 不为 nil，客户端会在执行重定向之前调用本函数字段。22 // 参数 req 和 via 是将要执行的请求和已经执行的请求（切片，越新的请求越靠后）。23 // 如果 CheckRedirect 返回一个错误，本类型的 Get 方法不会发送请求 req，24 // 而是返回之前得到的最后一个回复和该错误。（包装进 url.Error 类型里）25 //26 // 如果CheckRedirect为nil，会采用默认策略：连续10此请求后停止。27 CheckRedirect func(req *Request, via []*Request) error28 // Jar 指定 cookie 管理器。29 // 如果Jar为nil，请求中不会发送 cookie ，回复中的 cookie 会被忽略。30 Jar CookieJar31 // Timeout 指定本类型的值执行请求的时间限制。32 // 该超时限制包括连接时间、重定向和读取回复主体的时间。33 // 计时器会在 Head 、 Get 、 Post 或 Do 方法返回后继续运作并在超时后中断回复主体的读取。34 //35 // Timeout 为零值表示不设置超时。36 //37 // Client 实例的 Transport 字段必须支持 CancelRequest 方法，38 // 否则 Client 会在试图用 Head 、 Get 、 Post 或 Do 方法执行请求时返回错误。39 // 本类型的 Transport 字段默认值（ DefaultTransport ）支持 CancelRequest 方法。40 Timeout time.Duration41}426：Do 方法 func (c *Client) Do(req *Request) (resp *Response, err error)43调用者应该在读取完 resp.Body 后关闭它。如果返回值 resp 的主体未关闭，c 下层的 RoundTripper 接口（一般为 Transport 类型）可能无法重用 resp 主体下层保持的 TCP 连接去执行之后的请求。447:优化使用http读取数据 todo 使用sync优化http的读写45https://blog.thinkeridea.com/201901/go/you_ya_de_du_qu_http_qing_qiu_huo_xiang_ying_de_shu_ju.html46*/47func main() {48 //client := http.Client{Transport: &http.Transport{DisableKeepAlives: true}}49 //http.NewRequest()50}...

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client.go

Source:client.go Github

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1// A Client is higher-level than a RoundTripper (such as Transport)2// and additionally handles HTTP details such as cookies and redirects.3// NOTICE：关于HTTP client request的修改，应该参考http.Request结构4package main5import (6 "fmt"7 "io"8 "io/ioutil"9 "net"10 "net/http"11 "net/http/cookiejar"12 "time"13)14// A Client is an HTTP client. Its zero value (DefaultClient) is a)15// usable client that uses DefaultTransport.16func zeroValueClient() {17 client := http.Client{}18 resp, err := client.Head("http://www.baidu.com")19 if err != nil {20 panic(err)21 }22 defer resp.Body.Close()23 fmt.Println(resp.Status)24 io.Copy(ioutil.Discard, resp.Body)25}26// CheckRedirect func(req *Request, via []*Request) error27// 默认策略: If CheckRedirect is nil, the Client uses its default policy, which is to stop after 10 consecutive requests.28// If CheckRedirect is not nil, the client calls it before following an HTTP redirect.29// The arguments req and via are the upcoming request and the requests made already, oldest first.30// If CheckRedirect returns an error, the Client's Get method returns both the previous Response (with its Body closed) and CheckRedirect's error (wrapped in a url.Error)31// As a special case, if CheckRedirect returns ErrUseLastResponse, then the most recent response is returned with its body unclosed, along with a nil error.32// 与http-core-module/redirect.conf搭配33func redirect(req *http.Request, via []*http.Request) error {34 fmt.Println(req.URL, via[0].URL)35 return nil36}37func doRedirect() {38 client := http.Client{39 // 用法, 参见roundTrip.go40 Transport: http.DefaultTransport,41 CheckRedirect: redirect,42 }43 client.Get("http://localhost:8000/hello")44}45func doCookie() {46 // Set-Cookie: status=enable; expires=Tue, 05 Jul 2011 07:26:31 GMT;47 // path=/; domain=.hackr.jp;48 // The Jar is used to insert relevant cookies into every49 // outbound Request and is updated with the cookie values50 // of every inbound Response.51 jar, err := cookiejar.New(nil)52 if err != nil {53 panic(err)54 }55 client := http.Client{56 Jar: jar,57 }58 resp, err := client.Get("http://localhost:8888")59 resp, err = client.Get("http://localhost:8888")60 if err != nil {61 panic(err)62 }63 defer resp.Body.Close()64 fmt.Println(resp.Header.Get("Set-Cookie"))65}66func doTimeout() {67 go func() {68 ls, _ := net.Listen("tcp", "localhost:8000")69 ls.Accept()70 time.Sleep(time.Second)71 }()72 client := http.Client{73 Timeout: time.Millisecond,74 }75 // Client.Timeout exceeded while awaiting headers76 resp, err := client.Get("http://localhost:8000")77 if err != nil {78 panic(err)79 }80 defer resp.Body.Close()81 fmt.Println(io.Copy(ioutil.Discard, resp.Body))82}83func main() {84 doTimeout()85}...

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1.client.go

Source:1.client.go Github

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1package main2import (3 "fmt"4 "net/http"5 "net/http/httputil"6)7//测试1:8func test1() {9 resp, err := http.Get("http://www.imooc.com")10 if err != nil {11 panic(err)12 }13 defer resp.Body.Close()14 s, err := httputil.DumpResponse(resp, true)15 if err != nil {16 panic(err)17 }18 fmt.Printf("%s\n", s)19}20//测试2:21//通过控制头部来实现访问wwww.imooc.com 302跳转到 m.imooc.com22func test2() {23 request, err := http.NewRequest(http.MethodGet,24 "http://www.imooc.com", nil) //get没有request body25 request.Header.Add("User-Agent", "Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1")26 resp, err := http.DefaultClient.Do(request)27 if err != nil {28 panic(err)29 }30 defer resp.Body.Close()31 s, err := httputil.DumpResponse(resp, true)32 if err != nil {33 panic(err)34 }35 fmt.Printf("%s\n", s)36}37//test3:38//fcuntion purpose:39// use http.Client.CheckRedirect to test 30240//CheckRedirect.via:41// redirect may happen many times,every redirect's path store in it42//CheckRedirect.req:43//every redirect target stroe in req44func test3() {45 request, err := http.NewRequest(http.MethodGet,46 "http://www.imooc.com", nil) //get没有request body47 request.Header.Add("User-Agent",48 "Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1")49 client := http.Client{50 CheckRedirect: func(req *http.Request,51 via []*http.Request) error {52 fmt.Println("Redirect!!!!!!!!!!!!1:",req)53 return nil//use default redirect policy54 },55 }56 resp, err := client.Do(request)57 if err != nil {58 panic(err)59 }60 defer resp.Body.Close()61 s, err := httputil.DumpResponse(resp, true)62 if err != nil {63 panic(err)64 }65 fmt.Printf("%s\n", s)66}67func main() {68 //test1()69 test2()70}...

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checkRedirect

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1import (2func main() {3 client := &http.Client{4 }5 if err != nil {6 fmt.Println(err)7 }8 fmt.Println(resp)9}10func redirectPolicyFunc(req *http.Request, via []*http.Request) error {11}12import (13func main() {14 client := &http.Client{15 }16 if err != nil {17 fmt.Println(err)18 }19 fmt.Println(resp)20}21func redirectPolicyFunc(req *http.Request, via []*http.Request) error {22}23import (24func main() {25 client := &http.Client{26 }27 if err != nil {28 fmt.Println(err)29 }30 fmt.Println(resp)31}32func redirectPolicyFunc(req *http.Request, via []*http.Request) error {33}34import (35func main() {36 client := &http.Client{37 }38 if err != nil {39 fmt.Println(err)40 }41 fmt.Println(resp)42}43func redirectPolicyFunc(req *http.Request, via []*http.Request) error {44}45import (46func main() {47 client := &http.Client{48 }

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checkRedirect

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1import (2func main() {3 jar, _ := cookiejar.New(nil)4 client := &http.Client{Jar: jar}5 client.CheckRedirect = func(req *http.Request, via []*http.Request) error {6 fmt.Println("Redirected to: ", req.URL)7 }8}

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checkRedirect

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1import (2func main() {3 client := &http.Client{4 }5 resp, _ := client.Do(req)6 fmt.Println(resp.Status)7}8func redirectPolicyFunc(req *http.Request, via []*http.Request) error {9}10func defaultRedirectPolicy(req *http.Request, via []*http.Request) error {11 if len(via) >= 10 {12 return errors.New("stopped after 10 redirects")13 }14 if len(via) > 0 {15 for attr, val := range via[0].Header {16 if _, ok := req.Header[attr]; !ok {17 }18 }19 }20}

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checkRedirect

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1import (2func main() {3 client := &http.Client{4 }5 if err != nil {6 fmt.Println(err)7 }8 fmt.Println(resp.Status)9}10import (11func main() {12 client := &http.Client{13 }14 if err != nil {15 fmt.Println(err)16 }17 fmt.Println(resp.Status)18}19import (20func main() {21 client := &http.Client{22 }23 if err != nil {24 fmt.Println(err)25 }26 fmt.Println(resp.Status)27}28import (29func main() {30 client := &http.Client{31 }32 if err != nil {33 fmt.Println(err)34 }35 fmt.Println(resp.Status)36}37import (38func main() {39 client := &http.Client{40 }41 if err != nil {42 fmt.Println(err)43 }44 fmt.Println(resp.Status)45}46import (47func main() {48 client := &http.Client{49 }50 if err != nil {51 fmt.Println(err)52 }53 fmt.Println(resp.Status)54}55import (

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checkRedirect

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1import (2func main() {3 client := &http.Client{4 }5 if err != nil {6 fmt.Println(err)7 }8 defer resp.Body.Close()9 fmt.Println("Response Status:", resp.Status)10 fmt.Println("Response Headers:", resp.Header)11}12func redirectPolicyFunc(req *http.Request, via []*http.Request) error {13 req.Header.Add("X-From-Client", "true")14}15Response Headers: map[Content-Type:[text/html; charset=utf-8] Date:[Thu, 14 Feb 2019 07:50:38 GMT] Server:[Go-http-server/1.1]]

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checkRedirect

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1import (2func main() {3 jar, _ := cookiejar.New(nil)4 client := &http.Client{5 }6 request, _ := http.NewRequest("GET", url.String(), nil)7 request.AddCookie(&http.Cookie{8 })9 response, _ := client.Do(request)10 fmt.Println(response)11}12&{200 OK 200 HTTP/1.1 1 1 map[Date:[Wed, 30 Aug 2017 09:14:44 GMT] Content-Length:[0] Content-Type:[text/plain; charset=utf-8]] 0 [] false false map[] 0xc42000e3c0 <nil>}13import (14func main() {15 jar, _ := cookiejar.New(nil)16 client := &http.Client{17 }18 request, _ := http.NewRequest("GET", url.String(), nil)19 request.AddCookie(&http.Cookie{20 })21 response, _ := client.Do(request)22 fmt.Println(response.Cookies())23}24import (25func main() {26 jar, _ := cookiejar.New(nil)

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checkRedirect

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1import (2func main() {3 client := &http.Client{}4 if err != nil {5 fmt.Println(err)6 }7 client.CheckRedirect = func(req *http.Request, via []*http.Request) error {8 fmt.Println("Redirect:", req.URL)9 }10 _, err = client.Do(req)11 if err != nil {12 fmt.Println(err)13 }14}15import (16func main() {17 client := &http.Client{}

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checkRedirect

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1import (2func main() {3 client := &http.Client{}4 resp, err := client.Do(req)5 if err != nil {6 fmt.Println(err)7 }8 fmt.Println(resp.Status)9}10import (11func main() {12 client := &http.Client{}13 resp, err := client.Do(req)14 if err != nil {15 fmt.Println(err)16 }17 fmt.Println(resp.Status)18}19import (20func main() {21 client := &http.Client{}22 resp, err := client.Do(req)23 if err != nil {24 fmt.Println(err)25 }26 fmt.Println(resp.Status)27}28import (29func main() {30 client := &http.Client{}31 resp, err := client.Do(req)32 if err != nil {33 fmt.Println(err)34 }35 fmt.Println(resp.Status)36}37import (38func main() {39 client := &http.Client{}40 resp, err := client.Do(req)41 if err != nil {42 fmt.Println(err)43 }44 fmt.Println(resp.Status)45}46import (47func main() {48 client := &http.Client{}49 resp, err := client.Do(req

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checkRedirect

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1import (2func main() {3 jar, err := cookiejar.New(nil)4 if err != nil {5 fmt.Println(err)6 }7 client := &http.Client{8 }9 if err != nil {10 fmt.Println(err)11 }12 req, err := http.NewRequest("GET", url.String(), nil)13 if err != nil {14 fmt.Println(err)15 }16 resp, err := client.Do(req)17 if err != nil {18 fmt.Println(err)19 }20 defer resp.Body.Close()21 for _, cookie := range jar.Cookies(url) {22 fmt.Printf("%s: %s23 }24}

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checkRedirect

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1import (2func main() {3 client := &http.Client{4 }5 if err != nil {6 fmt.Println(err)7 os.Exit(1)8 }9 resp, err := client.Do(req)10 if err != nil {11 fmt.Println(err)12 os.Exit(1)13 }14 fmt.Println("Response Status:", resp.Status)15 fmt.Println("Response Headers:", resp.Header)16}17func redirectPolicyFunc(req *http.Request, via []*http.Request) error {18 fmt.Println("Redirecting to:", req.URL)19 if len(via) >= 10 {20 return fmt.Errorf("%d consecutive requests(redirects)", len(via))21 }22 if len(via) > 0 {23 if !sameHost(req.URL, via[0].URL) {24 return errors.New("Redirected to different host")25 }26 }27}28func sameHost(a, b *url.URL) bool {29 if a.User != b.User {30 }31 if a.Host != b.Host {32 }33 if a.Port() != b.Port() {34 }35}

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