【Android】OkHttp测试网络连接

科技2026-08-25 1

学而不思则罔，思而不学则殆

【Android】OkHttp测试网络连接

引言发送网络请求测试http1. 建立socket连接2. 发送请求3. 接受数据测试post数据测试http://www.baidu.com 测试https建立安全通道测试https://www.baidu.com/测试二总结

引言

知道OkHttp底层是通过Socket连接，发送网络请求，本篇文章就是模拟这种方式来发送网路请求

发送网络请求

测试http

1. 建立socket连接

public static void main(String[] args) { try { testHttp("http://localhost:3434/okhttp"); } catch (IOException e) { e.printStackTrace(); } } private static void testHttp(String url) throws IOException { OkHttpClient client = new OkHttpClient().newBuilder().build(); Request request = new Request.Builder().url(url).build(); System.out.println(request); HttpUrl httpUrl = request.url; System.out.println("httpUrl:" + httpUrl); System.out.println("host:" + httpUrl.host()); System.out.println("port:" + httpUrl.port()); System.out.println("pathSegments:" + httpUrl.pathSegments()); Dns dns = client.dns; System.out.println("dns:" + dns); List<InetAddress> addresses = dns.lookup(httpUrl.host()); //[localhost/127.0.0.1, localhost/0:0:0:0:0:0:0: System.out.println("addresses:" + addresses); SocketFactory socketFactory = client.socketFactory(); System.out.println("SocketFactory:" + socketFactory); //建立安全连接的时候需要 SSLSocketFactory sslSocketFactory = null; HostnameVerifier hostnameVerifier = null; CertificatePinner certificatePinner = null; if (httpUrl.isHttps()) { sslSocketFactory = client.sslSocketFactory(); hostnameVerifier = client.hostnameVerifier(); certificatePinner = client.certificatePinner(); } Authenticator authenticator = client.authenticator(); Proxy proxy = client.proxy(); List<Protocol> protocols = client.protocols; System.out.println("DEFAULT_PROTOCOLS:" + protocols); List<ConnectionSpec> connectionSpecs = client.connectionSpecs; System.out.println("DEFAULT_CONNECTION_SPECS:" + connectionSpecs); ProxySelector proxySelector = ProxySelector.getDefault(); System.out.println("ProxySelector:" + proxySelector); //创建Address Address address = new Address(httpUrl.host, httpUrl.port, dns, socketFactory, sslSocketFactory, hostnameVerifier, certificatePinner, authenticator, proxy, protocols, connectionSpecs, proxySelector); //建立socket连接 Socket socket = socketFactory.createSocket(); //需要IPV4 InetAddress inetAddress = addresses.get(0); //localhost/127.0.0.1 System.out.println(inetAddress); //构建InetSocketAddress InetSocketAddress inetSocketAddress = new InetSocketAddress(inetAddress, httpUrl.port); //localhost/127.0.0.1:3434 System.out.println(inetSocketAddress); //socket.connect(inetAddress, 1000); socket.connect(inetSocketAddress); System.out.println("socket:" + socket); //获取输入输出流 OutputStream outputStream = socket.getOutputStream(); InputStream inputStream = socket.getInputStream(); } Request{method=GET, url=http://localhost:3434/okhttp, tag=null} httpUrl:http://localhost:3434/okhttp host:localhost port:3434 pathSegments:[okhttp] dns:okhttp3.Dns$1@7506e922 addresses:[localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] SocketFactory:javax.net.DefaultSocketFactory@4ee285c6 DEFAULT_PROTOCOLS:[h2, http/1.1] DEFAULT_CONNECTION_SPECS:[ConnectionSpec(cipherSuites=[TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_256_GCM_SHA384, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_256_CBC_SHA, SSL_RSA_WITH_3DES_EDE_CBC_SHA], tlsVersions=[TLS_1_3, TLS_1_2, TLS_1_1, TLS_1_0], supportsTlsExtensions=true), ConnectionSpec()] ProxySelector:sun.net.spi.DefaultProxySelector@621be5d1 localhost/127.0.0.1 localhost/127.0.0.1:3434 socket:Socket[addr=localhost/127.0.0.1,port=3434,localport=58392]

当目前为止已经建立了连接，由于http是不安全的连接，不需要嵌套安全连接。

2. 发送请求

模拟发送http请求

String header = "GET http://localhost:3434/okhttp HTTP/1.1\r\n"; outputStream.write(header.getBytes()); //发送请求头 outputStream.write("Accept-Encoding: gzip\r\n".getBytes()); outputStream.write("Connection: keep-alive\r\n".getBytes()); outputStream.write("Host: localhost:3434\r\n".getBytes()); outputStream.write("User-Agent: DiyClient/zy\r\n".getBytes()); outputStream.write("\r\n".getBytes()); outputStream.flush();

3. 接受数据

//读取数据 byte[] data = new byte[1024]; System.out.println("read..."); int read = inputStream.read(data); while (read != -1) { System.out.println(new String(data)); read = inputStream.read(data); } HTTP/1.1 200 OK Date: Fri, 09 Oct 2020 00:30:45 GMT Content-Type: application/json; charset=UTF-8 author: zy Connection: close Server: Jetty(9.3.2.v20150730) {"code":200,"msg":"OK","data":"GET from Server,Your Msg is :"}

测试post数据

确认请求行

POST http://localhost:3434/okhttp HTTP/1.1 Accept-Encoding: gzip Connection: keep-alive Content-Length: 22 Content-Type: application/json; charset=UTF-8 Host: localhost:3434 User-Agent: zy/test {"name":"zy","age":18}

用java代码发送：

//发送请求行 String header = "POST http://localhost:3434/okhttp HTTP/1.1\r\n"; outputStream.write(header.getBytes()); //发送请求头 outputStream.write("Accept-Encoding: gzip\r\n".getBytes()); outputStream.write("Connection: keep-alive\r\n".getBytes()); outputStream.write("Host: localhost:3434\r\n".getBytes()); outputStream.write("Content-Length: 22\r\n".getBytes()); outputStream.write("Content-Type: application/json; charset=UTF-8\r\n".getBytes()); outputStream.write("User-Agent: DiyClient/zy\r\n".getBytes()); outputStream.write("\r\n".getBytes()); outputStream.write("{\"name\":\"zy\",\"age\":18}".getBytes());//发送内容 outputStream.write("\r\n".getBytes()); outputStream.flush();

结果如下：

Request{method=GET, url=http://localhost:3434/okhttp, tag=null} httpUrl:http://localhost:3434/okhttp host:localhost port:3434 pathSegments:[okhttp] dns:okhttp3.Dns$1@7506e922 addresses:[localhost/127.0.0.1, localhost/0:0:0:0:0:0:0:1] SocketFactory:javax.net.DefaultSocketFactory@4ee285c6 DEFAULT_PROTOCOLS:[h2, http/1.1] DEFAULT_CONNECTION_SPECS:[ConnectionSpec(cipherSuites=[TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_256_GCM_SHA384, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_256_CBC_SHA, SSL_RSA_WITH_3DES_EDE_CBC_SHA], tlsVersions=[TLS_1_3, TLS_1_2, TLS_1_1, TLS_1_0], supportsTlsExtensions=true), ConnectionSpec()] ProxySelector:sun.net.spi.DefaultProxySelector@621be5d1 localhost/127.0.0.1 localhost/127.0.0.1:3434 socket:Socket[addr=localhost/127.0.0.1,port=3434,localport=58505] read... HTTP/1.1 200 OK Date: Fri, 09 Oct 2020 00:46:45 GMT Content-Type: application/json; charset=UTF-8 author: zy Connection: close Server: Jetty(9.3.2.v20150730) {"code":200,"msg":"OK","data":"POST from Server,Your Msg is :{\"name\":\"zy\",\"age\":18}"}

成功发送post请求。

测试http://www.baidu.com

发现返回来的参数都是乱码原来在请求头中添加了Accept-Encoding字段，但是本地却没有编码处理，所以移除掉这个字段。

//outputStream.write("Accept-Encoding: gzip\r\n".getBytes());

把编码屏蔽掉，在测试一下。

Request{method=GET, url=http://www.baidu.com/, tag=null} httpUrl:http://www.baidu.com/ host:www.baidu.com port:80 pathSegments:[] dns:okhttp3.Dns$1@7506e922 addresses:[www.baidu.com/14.215.177.39, www.baidu.com/14.215.177.38] SocketFactory:javax.net.DefaultSocketFactory@4ee285c6 DEFAULT_PROTOCOLS:[h2, http/1.1] DEFAULT_CONNECTION_SPECS:[ConnectionSpec(cipherSuites=[TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_256_GCM_SHA384, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_256_CBC_SHA, SSL_RSA_WITH_3DES_EDE_CBC_SHA], tlsVersions=[TLS_1_3, TLS_1_2, TLS_1_1, TLS_1_0], supportsTlsExtensions=true), ConnectionSpec()] ProxySelector:sun.net.spi.DefaultProxySelector@621be5d1 www.baidu.com/14.215.177.39 www.baidu.com/14.215.177.39:80 socket:Socket[addr=www.baidu.com/14.215.177.39,port=80,localport=58461] read... 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测试https

模拟https的难点在于需要建立一个安全连接后，才能通信。那么怎么才能建立安全连接通道呢？其实OkHttp中已经有了答案，我们先抄一份过来，试着跑跑看。

建立安全通道

private static void testHttps(String url) throws IOException { OkHttpClient client = new OkHttpClient().newBuilder().build(); Request request = new Request.Builder().url(url).build(); System.out.println(request); HttpUrl httpUrl = request.url; System.out.println("httpUrl:" + httpUrl); System.out.println("host:" + httpUrl.host()); System.out.println("port:" + httpUrl.port()); System.out.println("pathSegments:" + httpUrl.pathSegments()); Dns dns = client.dns; System.out.println("dns:" + dns); List<InetAddress> addresses = dns.lookup(httpUrl.host()); //[localhost/127.0.0.1, localhost/0:0:0:0:0:0:0: System.out.println("addresses:" + addresses); SocketFactory socketFactory = client.socketFactory(); System.out.println("SocketFactory:" + socketFactory); //建立安全连接的时候需要 SSLSocketFactory sslSocketFactory = null; HostnameVerifier hostnameVerifier = null; CertificatePinner certificatePinner = null; if (httpUrl.isHttps()) { sslSocketFactory = client.sslSocketFactory(); hostnameVerifier = client.hostnameVerifier(); certificatePinner = client.certificatePinner(); } Authenticator authenticator = client.authenticator(); Proxy proxy = client.proxy(); List<Protocol> protocols = client.protocols; System.out.println("DEFAULT_PROTOCOLS:" + protocols); List<ConnectionSpec> connectionSpecs = client.connectionSpecs; System.out.println("DEFAULT_CONNECTION_SPECS:" + connectionSpecs); ProxySelector proxySelector = ProxySelector.getDefault(); System.out.println("ProxySelector:" + proxySelector); //创建Address Address address = new Address(httpUrl.host, httpUrl.port, dns, socketFactory, sslSocketFactory, hostnameVerifier, certificatePinner, authenticator, proxy, protocols, connectionSpecs, proxySelector); //建立socket连接 Socket socket = address.socketFactory.createSocket(); //需要IPV4 InetAddress inetAddress = addresses.get(0); //localhost/127.0.0.1 System.out.println(inetAddress); //构建InetSocketAddress InetSocketAddress inetSocketAddress = new InetSocketAddress(inetAddress, httpUrl.port); //localhost/127.0.0.1:3434 System.out.println(inetSocketAddress); //socket.connect(inetAddress, 1000); socket.connect(inetSocketAddress); System.out.println("socket:" + socket); List<Proxy> proxiesOrNull = address.proxySelector().select(httpUrl.uri()); System.out.println("proxiesOrNull:" + proxiesOrNull); // Create the wrapper over the connected socket. /* autoClose */ //建立安全通道 SSLSocket sslSocket = (SSLSocket) sslSocketFactory.createSocket( socket, address.url().host(), address.url().port(), true /* autoClose */); BufferedSource source = Okio.buffer(Okio.source(sslSocket)); BufferedSink sink = Okio.buffer(Okio.sink(sslSocket)); System.out.println("source:" + source); System.out.println("sink:" + sink); //发送请求数据 System.out.println("请求request--------------------------"); //请求行 String requestLine = RequestLine.get(request, proxiesOrNull.get(0).type()); System.out.println(requestLine); sink.writeUtf8(requestLine).writeUtf8("\r\n"); //请求头 String host = "Host: " + httpUrl.host; System.out.println(host); sink.writeUtf8(host).writeUtf8("\r\n"); sink.writeUtf8("\r\n"); //请求正文 //nothing sink.writeUtf8("\r\n"); sink.flush(); //读取数据 byte[] data = new byte[1024]; System.out.println("read..."); int read = source.read(data); System.out.println("read:" + read); System.out.println("响应response--------------------------"); while (read != -1) { System.out.println(new String(data)); read = source.read(data); System.out.println("read:" + read); } }

其中连接安全通道的是：

// Create the wrapper over the connected socket. /* autoClose */ SSLSocket sslSocket = (SSLSocket) sslSocketFactory.createSocket( socket, address.url().host(), address.url().port(), true /* autoClose */); BufferedSource source = Okio.buffer(Okio.source(sslSocket)); BufferedSink sink = Okio.buffer(Okio.sink(sslSocket)); System.out.println("source:" + source); System.out.println("sink:" + sink);

有兴趣可以查看：OkHttp源码中RealConnection.connectTls方法中的具体逻辑。RealConnection.java

测试https://www.baidu.com/

Request{method=GET, url=https://www.baidu.com/, tag=null} httpUrl:https://www.baidu.com/ host:www.baidu.com port:443 pathSegments:[] dns:okhttp3.Dns$1@7506e922 addresses:[www.baidu.com/14.215.177.38, www.baidu.com/14.215.177.39] SocketFactory:javax.net.DefaultSocketFactory@4ee285c6 DEFAULT_PROTOCOLS:[h2, http/1.1] DEFAULT_CONNECTION_SPECS:[ConnectionSpec(cipherSuites=[TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_256_GCM_SHA384, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_256_CBC_SHA, SSL_RSA_WITH_3DES_EDE_CBC_SHA], tlsVersions=[TLS_1_3, TLS_1_2, TLS_1_1, TLS_1_0], supportsTlsExtensions=true), ConnectionSpec()] ProxySelector:sun.net.spi.DefaultProxySelector@621be5d1 www.baidu.com/14.215.177.38 www.baidu.com/14.215.177.38:443 socket:Socket[addr=www.baidu.com/14.215.177.38,port=443,localport=59750] proxiesOrNull:[DIRECT] source:buffer(AsyncTimeout.source(source(sun.security.ssl.AppInputStream@6442b0a6))) sink:buffer(AsyncTimeout.sink(sink(sun.security.ssl.AppOutputStream@60f82f98))) 请求request-------------------------- GET / HTTP/1.1 Host: www.baidu.com read... read:1024 响应response-------------------------- HTTP/1.1 200 OK Accept-Ranges: bytes Cache-Control: no-cache Connection: keep-alive Content-Length: 14722 Content-Type: text/html Date: Sat, 10 Oct 2020 00:02:59 GMT P3p: CP=" OTI DSP COR IVA OUR IND COM " P3p: CP=" OTI DSP COR IVA OUR IND COM " Pragma: no-cache Server: BWS/1.1 Set-Cookie: BAIDUID=2EAFECDDC8AA49589A7317F78D3F24F5:FG=1; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: BIDUPSID=2EAFECDDC8AA49589A7317F78D3F24F5; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: PSTM=1602288179; expires=Thu, 31-Dec-37 23:55:55 GMT; max-age=2147483647; path=/; domain=.baidu.com Set-Cookie: BAIDUID=2EAFECDDC8AA4958A1B52B5307757E9E:FG=1; max-age=31536000; expires=Sun, 10-Oct-21 00:02:59 GMT; domain=.baidu.com; path=/; version=1; comment=bd Traceid: 160228817902555540587373353520019628821 Vary: Accept-Encoding X-Ua-Compatible: IE=Edge,chrome=1 <!DOCTYPE html> <html> <head> <meta http-equi read:1024 v="content-type" content="text/html;charset=utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"> <link rel="dns-prefetch" href="//s1.bdstatic.com"/> <link rel="dns-prefetch" href="//t1.baidu.com"/> <link rel="dns-prefetch" href="//t2.baidu.com"/> <link rel="dns-prefetch" href="//t3.baidu.com"/> <link rel="dns-prefetch" href="//t10.baidu.com"/> <link rel="dns-prefetch" href="//t11.baidu.com"/> <link rel="dns-prefetch" href="//t12.baidu.com"/> <link rel="dns-prefetch" href="//b1.bdstatic.com"/> <title>百度一下，你就知道</title> <link href="https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/home/css/index.css" rel="stylesheet" type="text/css" />   <script>var hashMatch = document.location.href.match(/#+(.*wd=[^&].+)/);if (hashMatch && hashMatch[0] && ha read:1024 shMatch[1]) {document.location.replace("http://"+location.host+"/s?"+hashMatch[1]);}var ns_c = function(){};</script> <script>function h(obj){obj.style.behavior='url(#default#homepage)';var a = obj.setHomePage('//www.baidu.com/');}</script> <noscript><meta http-equiv="refresh" content="0; url=/baidu.html?from=noscript"/></noscript> <script>window._ASYNC_START=new Date().getTime();</script> </head> <body link="#0000cc"><div id="wrapper" style="display:none;"><div id="u"><a href="//www.baidu.com/gaoji/preferences.html" onmousedown="return user_c({'fm':'set','tab':'setting','login':'0'})">搜索设置</a>|<a id="btop" href="/" onmousedown="return user_c({'fm':'set','tab':'index','login':'0'})">百度首页</a>|<a id="lb" href="https://passport.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" onclick="return false;" onmousedown="return user_c({'fm':'set','tab':'login'})">登录</a><a href="https://passport.baidu.com/v2/?reg&regType=1&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" onmousedown="retu read:928 rn user_c({'fm':'set','tab':'reg'})" target="_blank" class="reg">注册</a></div><div id="head"><div class="s_nav"><a href="/" class="s_logo" οnmοusedοwn="return c({'fm':'tab','tab':'logo'})"><img src="//www.baidu.com/img/baidu_jgylogo3.gif" width="117" height="38" border="0" alt="到百度首页" title="到百度首页"></a><div class="s_tab" id="s_tab"><a href="http://news.baidu.com/ns?cl=2&rn=20&tn=news&word=" wdfield="word" οnmοusedοwn="return c({'fm':'tab','tab':'news'})">新闻</a>　<b>网页</b>　<a href="http://tieba.baidu.com/f?kw=&fr=wwwt" wdfield="kw" οnmοusedοwn="return c({'fm':'tab','tab':'tieba'})">贴吧</a>　<a href="http://zhidao.baidu.com/q?ct=17&pn=0&tn=ikaslist&rn=10&word=&fr=wwwt" wdfield="word" οnmοusedοwn="return c({'fm':'tab','tab':'zhidao'})">知道</a>　<a href="http://music.baidu.com/search?fr=ps&key=" wdfield="key" οnmοusedοwn="return c({'fm':'tab','tab':'musi/passport.baidu.com/v2/?reg&regType=1&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" οnmοusedοwn="retu read:96 c'})">音乐</a>　<a href="http://image.baidu.com/i?tn=baiduimage&ps=1&ct=201326592&lm=-1&<div class="s_nav"><a href="/" class="s_logo" οnmοusedοwn="return c({'fm':'tab','tab':'logo'})"><img src="//www.baidu.com/img/baidu_jgylogo3.gif" width="117" height="38" border="0" alt="到百度首页" title="到百度首页"></a><div class="s_tab" id="s_tab"><a href="http://news.baidu.com/ns?cl=2&rn=20&tn=news&word=" wdfield="word" οnmοusedοwn="return c({'fm':'tab','tab':'news'})">新闻</a>　<b>网页</b>　<a href="http://tieba.baidu.com/f?kw=&fr=wwwt" wdfield="kw" οnmοusedοwn="return c({'fm':'tab','tab':'tieba'})">贴吧</a>　<a href="http://zhidao.baidu.com/q?ct=17&pn=0&tn=ikaslist&rn=10&word=&fr=wwwt" wdfield="word" οnmοusedοwn="return c({'fm':'tab','tab':'zhidao'})">知道</a>　<a href="http://music.baidu.com/search?fr=ps&key=" wdfield="key" οnmοusedοwn="return c({'fm':'tab','tab':'musi/passport.baidu.com/v2/?reg&regType=1&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" οnmοusedοwn="retu read:1024 cl=2&nc=1&word=" wdfield="word" οnmοusedοwn="return c({'fm':'tab','tab':'pic'})">图片</a>　<a href="http://v.baidu.com/v?ct=301989888&rn=20&pn=0&db=0&s=25&word=" wdfield="word" οnmοusedοwn="return c({'fm':'tab','tab':'video'})">视频</a>　<a href="http://map.baidu.com/m?word=&fr=ps01000" wdfield="word" οnmοusedοwn="return c({'fm':'tab','tab':'map'})">地图</a>　<a href="http://wenku.baidu.com/search?word=&lm=0&od=0" wdfield="word" οnmοusedοwn="return c({'fm':'tab','tab':'wenku'})">文库</a>　<a href="//www.baidu.com/more/" οnmοusedοwn="return c({'fm':'tab','tab':'more'})">更多»</a></div></div><form id="form" name="f" action="/s" class="fm" ><input type="hidden" name="ie" value="utf-8"><input type="hidden" name="f" value="8"><input type="hidden" name="rsv_bp" value="1"><span class="bg s_ipt_wr"><input name="wd" id="kw" class="s_ipt" value="" maxlength="100"></span><span class="bg s_btn_wr"><input type="submit" id="su" value="百度一下" class="bg s_btn" οnmοusedοwn="this read:1024 .className='bg s_btn s_btn_h'" οnmοuseοut="this.className='bg s_btn'"></span><span class="tools"><span id="mHolder"><div id="mCon"><span>输入法</span></div><ul id="mMenu"><li><a href="javascript:;" name="ime_hw">手写</a></li><li><a href="javascript:;" name="ime_py">拼音</a></li><li class="ln"></li><li><a href="javascript:;" name="ime_cl">关闭</a></li></ul></span><span class="shouji"><strong>推荐 : </strong><a href="http://w.x.baidu.com/go/mini/8/10000020" οnmοusedοwn="return ns_c({'fm':'behs','tab':'bdbrowser'})">百度浏览器，打开网页快2秒！</a></span></span></form></div><div id="content"><div id="u1"><a href="http://news.baidu.com" name="tj_trnews" class="mnav">新闻</a><a href="http://www.hao123.com" name="tj_trhao123" class="mnav">hao123</a><a href="http://map.baidu.com" name="tj_trmap" class="mnav">地图</a><a href="http://v.baidu.com" name="tj_trvideo" class="mnav">视频</a><a href="http://tieba.baidu.com" name="tj_trtieba" class="mnav">贴吧</a><a href="https://passp read:1024 ort.baidu.com/v2/?login&tpl=mn&u=http%3A%2F%2Fwww.baidu.com%2F" name="tj_login" id="lb" οnclick="return false;">登录</a><a href="//www.baidu.com/gaoji/preferences.html" name="tj_settingicon" id="pf">设置</a><a href="//www.baidu.com/more/" name="tj_briicon" id="bri">更多产品</a></div><div id="m"><p id="lg"><img src="//www.baidu.com/img/bd_logo.png" width="270" height="129"></p><p id="nv"><a href="http://news.baidu.com">新 闻</a>　<b>网 页</b>　<a href="http://tieba.baidu.com">贴 吧</a>　<a href="http://zhidao.baidu.com">知 道</a>　<a href="http://music.baidu.com">音 乐</a>　<a href="http://image.baidu.com">图 片</a>　<a href="http://v.baidu.com">视 频</a>　<a href="http://map.baidu.com">地 图</a></p><div id="fm"><form id="form1" name="f1" action="/s" class="fm"><span class="bg s_ipt_wr"><input type="text" name="wd" id="kw1" maxlength="100" class="s_ipt"></span><input type="hidden" name="rsv_bp" value="0"><input type=hidden name=ch value=""> read:928 <input type=hidden name=tn value="baidu"><input type=hidden name=bar value=""><input type="hidden" name="rsv_spt" value="3"><input type="hidden" name="ie" value="utf-8"><span class="bg s_btn_wr"><input type="submit" value="百度一下" id="su1" class="bg s_btn" onmousedown="this.className='bg s_btn s_btn_h'" onmouseout="this.className='bg s_btn'"></span></form><span class="tools"><span id="mHolder1"><div id="mCon1"><span>输入法</span></div></span></span><ul id="mMenu1"><div class="mMenu1-tip-arrow"><em></em><ins></ins></div><li><a href="javascript:;" name="ime_hw">手写</a></li><li><a href="javascript:;" name="ime_py">拼音</a></li><li class="ln"></li><li><a href="javascript:;" name="ime_cl">关闭</a></li></ul></div><p id="lk"><a 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$s.find('li').length;if(l>=5){$s.addClass('bdsugbg');}else{$s.removeClass('bdsugbg');}});}if(btnwr && btn){btnwr.on('mouseover',function(){btn.addClass('btnhover');}).on('mouseout',function(){btn.removeClass('btnhover');});}}});</script> <script type="text/javascript" src="https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/home/js/bri_7f1fa703.js"></script> <script>(function(){var _init=false;window.initIndex=function(){if(_init){return;}_init=true;var w=window,d=document,n=navigator,k=d read:1024 .f1.wd,a=d.getElementById("nv").getElementsByTagName("a"),isIE=n.userAgent.indexOf("MSIE")!=-1&&!window.opera;(function(){if(/q=([^&]+)/.test(location.search)){k.value=decodeURIComponent(RegExp["\x241"])}})();(function(){var u = G("u1").getElementsByTagName("a"), nv = G("nv").getElementsByTagName("a"), lk = G("lk").getElementsByTagName("a"), un = "";var tj_nv = ["news","tieba","zhidao","mp3","img","video","map"];var tj_lk = ["baike","wenku","hao123","more"];un = bds.comm.user == "" ? "" : bds.comm.user;function _addTJ(obj){addEV(obj, "mousedown", function(e){var e = e || window.event;var target = e.target || e.srcElement;if(target.name){ns_c({'fm':'behs','tab':target.name,'un':encodeURIComponent(un)});}});}for(var i = 0; i < u.length; i++){_addTJ(u[i]);}for(var i = 0; i < nv.length; i++){nv[i].name = 'tj_' + tj_nv[i];}for(var i = 0; i < lk.length; i++){lk[i].name = 'tj_' + tj_lk[i];}})();(function() {var links = {'tj_news': ['word', 'http://news.baidu.com/ns?tn=news&cl=2&rn=20&ct=1&ie=utf-8'],'tj_tieba': ['kw read:1024 ', 'http://tieba.baidu.com/f?ie=utf-8'],'tj_zhidao': ['word', 'http://zhidao.baidu.com/search?pn=0&rn=10&lm=0'],'tj_mp3': ['key', 'http://music.baidu.com/search?fr=ps&ie=utf-8'],'tj_img': ['word', 'http://image.baidu.com/i?ct=201326592&cl=2&nc=1&lm=-1&st=-1&tn=baiduimage&istype=2&fm=&pv=&z=0&ie=utf-8'],'tj_video': ['word', 'http://video.baidu.com/v?ct=301989888&s=25&ie=utf-8'],'tj_map': ['wd', 'http://map.baidu.com/?newmap=1&ie=utf-8&s=s'],'tj_baike': ['word', 'http://baike.baidu.com/search/word?pic=1&sug=1&enc=utf8'],'tj_wenku': ['word', 'http://wenku.baidu.com/search?ie=utf-8']};var domArr = [G('nv'), G('lk'),G('cp')],kw = G('kw1');for (var i = 0, l = domArr.length; i < l; i++) {domArr[i].onmousedown = function(e) {e = e || window.event;var target = e.target || e.srcElement,name = target.getAttribute('name'),items = links[name],reg = new RegExp('^\\s+|\\s+\x24'),key = kw.value.replace(reg, '');if (items) {if (key.length > 0) {var wd = items[0], url = items[1],url = url + ( name === 'tj_map' ? encodeURICompo read:513 nent('&' + wd + '=' + key) : ( ( url.indexOf('?') > 0 ? '&' : '?' ) + wd + '=' + encodeURIComponent(key) ) );target.href = url;} else {target.href = target.href.match(new RegExp('^http:\/\/.+\.baidu\.com'))[0];}}name && ns_c({'fm': 'behs','tab': name,'query': encodeURIComponent(key),'un': encodeURIComponent(bds.comm.user || '') });};}})();};if(window.pageState==0){initIndex();}})();document.cookie = 'IS_STATIC=1;expires=' + new Date(new Date().getTime() + 10*60*1000).toGMTString();</script> </body></html> enc=utf8'],'tj_wenku': ['word', 'http://wenku.baidu.com/search?ie=utf-8']};var domArr = [G('nv'), G('lk'),G('cp')],kw = G('kw1');for (var i = 0, l = domArr.length; i < l; i++) {domArr[i].onmousedown = function(e) {e = e || window.event;var target = e.target || e.srcElement,name = target.getAttribute('name'),items = links[name],reg = new RegExp('^\\s+|\\s+\x24'),key = kw.value.replace(reg, '');if (items) {if (key.length > 0) {var wd = items[0], url = items[1],url = url + ( name === 'tj_map' ? encodeURICompo read:28 HTTP/1.1 400 Bad Request ( ( url.indexOf('?') > 0 ? '&' : '?' ) + wd + '=' + encodeURIComponent(key) ) );target.href = url;} else {target.href = target.href.match(new RegExp('^http:\/\/.+\.baidu\.com'))[0];}}name && ns_c({'fm': 'behs','tab': name,'query': encodeURIComponent(key),'un': encodeURIComponent(bds.comm.user || '') });};}})();};if(window.pageState==0){initIndex();}})();document.cookie = 'IS_STATIC=1;expires=' + new Date(new Date().getTime() + 10*60*1000).toGMTString();</script> </body></html> enc=utf8'],'tj_wenku': ['word', 'http://wenku.baidu.com/search?ie=utf-8']};var domArr = [G('nv'), G('lk'),G('cp')],kw = G('kw1');for (var i = 0, l = domArr.length; i < l; i++) {domArr[i].onmousedown = function(e) {e = e || window.event;var target = e.target || e.srcElement,name = target.getAttribute('name'),items = links[name],reg = new RegExp('^\\s+|\\s+\x24'),key = kw.value.replace(reg, '');if (items) {if (key.length > 0) {var wd = items[0], url = items[1],url = url + ( name === 'tj_map' ? encodeURICompo read:-1

可以看到正常访问了https的连接

测试二

https://blog.csdn.net/yuzhangzhen/article/details/108971902 这是本篇文章的地址。

Request{method=GET, url=https://blog.csdn.net/yuzhangzhen/article/details/108971902, tag=null} httpUrl:https://blog.csdn.net/yuzhangzhen/article/details/108971902 host:blog.csdn.net port:443 pathSegments:[yuzhangzhen, article, details, 108971902] dns:okhttp3.Dns$1@7506e922 addresses:[blog.csdn.net/112.126.96.31] SocketFactory:javax.net.DefaultSocketFactory@4ee285c6 DEFAULT_PROTOCOLS:[h2, http/1.1] DEFAULT_CONNECTION_SPECS:[ConnectionSpec(cipherSuites=[TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256, TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384, TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256, TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA, TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_256_GCM_SHA384, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_256_CBC_SHA, SSL_RSA_WITH_3DES_EDE_CBC_SHA], tlsVersions=[TLS_1_3, TLS_1_2, TLS_1_1, TLS_1_0], supportsTlsExtensions=true), ConnectionSpec()] ProxySelector:sun.net.spi.DefaultProxySelector@621be5d1 blog.csdn.net/112.126.96.31 blog.csdn.net/112.126.96.31:443 socket:Socket[addr=blog.csdn.net/112.126.96.31,port=443,localport=60159] proxiesOrNull:[DIRECT] source:buffer(AsyncTimeout.source(source(sun.security.ssl.AppInputStream@6442b0a6))) sink:buffer(AsyncTimeout.sink(sink(sun.security.ssl.AppOutputStream@60f82f98))) 请求request-------------------------- GET /yuzhangzhen/article/details/108971902 HTTP/1.1 Host: blog.csdn.net read... read:1024 响应response-------------------------- HTTP/1.1 404 Not Found Server: openresty Date: Sat, 10 Oct 2020 00:11:49 GMT Content-Type: text/html; charset=utf-8 Content-Length: 29999 Connection: keep-alive Keep-Alive: timeout=20 Vary: Accept-Encoding Set-Cookie: dc_sid=72692a321d3fbb58fdc9f7aafe13ea47; Expires=Session; Path=/; Domain=.csdn.net; ETag: "5f6d9ae3-752f" <!DOCTYPE html> <html> <head> <meta name="report" content='{"pid":"404"}'> <meta http-equiv="content-type" content="text/html; charset=utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=Edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta name="apple-mobile-web-app-status-bar-style" content="black"> <meta name="referrer" content="always"> <script src="https://g.csdnimg.cn/??lib/jquery/1.9.1/jquery.js,report/1.5.0/report.js" type="text/javascript"></script> <link rel="stylesheet" href="https://csdnimg.cn/public/static/css/avatar.css"> <meta http-equiv="Cache-Control" content="no-siteapp" /><link rel="alternate" read:1024 media="handheld" href="#" /> <meta name="shenma-site-verification" content="5a59773ab8077d4a62bf469ab966a63b_1497598848"> <title>404</title> <link href="https://csdnimg.cn/public/favicon.ico" rel="SHORTCUT ICON"> <link rel="stylesheet" href="https://g.csdnimg.cn/404error/1.0.0/css/error.css"> <link rel="stylesheet" href="https://g.csdnimg.cn/404error/1.0.0/css/error_e_book.css"> <script src="https://g.csdnimg.cn/fixed-sidebar/1.0.8/fixed-sidebar.js" type="text/javascript"></script> <script type="text/javascript"> ...

同样也是能够访问https

总结

通过上面测试http和https，可以得出网络请求主要是

建立一个socket通道，当然这个通道分为安全通道和非安全通道；然后获取一个输入流和输出流，输出流把请求信息写入（这个协议也可以自定义，只要通信双方可以规定好）。然后从输出流中获取返回的结果。然后关闭通道，请求结束

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