Http Header之User-Agent
User-Agent中文名为用户代理，是Http协议中的一部分，属于头域的组成部分，User Agent页简称UA。她是一个特殊字符串头，是一种想访问网站提供你说使用的浏览器类型和版本，操作系统和版本，浏览器内核等信息的标识，用户所访问的网站可以显示不同的排版，而为用户提供更好的体验或者进行信息统计
现象说明
用OKhttp框架请求http请求的时候会把user-agent带上；然而有些时候我们需要把请求头里面的user-agent去掉；
客户端程序：
private static final String BASE_URL = "http://192.168.253.200:8080/Chapter/";
public static void testHeaders() {
HttpClient httpClient = new HttpClient.Builder(BASE_URL).isDebug(false)
.add("header", "12345")
.header("master", "china")
.connectTimeout(5000)
.readTimeout(5000)
.build();
httpClient.Api().send(new HttpClient.Builder().url("postParam")
.add("header", "123459")
.add("master", "usa")
.add("token", "388298a0c89f4a38b2fed4cd4123d441")
.method(Method.POST)
.build(), new ResultSubscriber<>(new ResultListener<Object>() {
@Override
public void onResponse(Object t) {
System.out.println(t);
}
}));
}
返回结果：
{
"headers":{
"content-length":"76",
"host":"192.168.253.200:8080",
"client":"Android Client",
"content-type":"application/x-www-form-urlencoded",
"connection":"Keep-Alive",
"accept-encoding":"gzip",
"master":"china",
"user-agent":"okhttp/3.4.1"
},
"header":"123459",
"master":"usa",
"token":"388298a0c89f4a38b2fed4cd4123d441"
}
你会发现： "user-agent":"okhttp/3.4.1" 这是由于okhttp内置拦截器BridgeInterceptor默认添加的。我们需要借助网络拦截器来重新拦截请求头；
解决方法：
利用拦截器来实现对user-agent删除
public class LogInterceptor implements Interceptor {
private HttpClient builder;
@Override
public Response intercept(Chain chain) throws IOException {
Request request = chain.request();
request =request.newBuilder().removeHeader("User-Agent").build();
Response response = chain.proceed(request);
okhttp3.MediaType mediaType = response.body().contentType();
String content = response.body().string();
return response.newBuilder()
.body(okhttp3.ResponseBody.create(mediaType, content))
.build();
然后利用网络拦截器来设置自定义的拦截器LogInterceptor ：
Builder okBuilder = new OkHttpClient.Builder()
.connectTimeout(mbuilder.getConnectTimeout(), TimeUnit.SECONDS)
.readTimeout(mbuilder.getReadTimeout(), TimeUnit.SECONDS)
.writeTimeout(mbuilder.getWriteTimeout(), TimeUnit.SECONDS)
.sslSocketFactory(OkhttpUtils.createSSLSocketFactory(), new OkhttpUtils. TrustAllCerts())// 信任所有证书
.hostnameVerifier(new OkhttpUtils.TrustAllHostnameVerifier());
LogInterceptor logInterceptor = new LogInterceptor();
logInterceptor.setBuilder(mbuilder);
//okBuilder.addInterceptor(logInterceptor);//应用拦截器
okBuilder.addNetworkInterceptor(logInterceptor);//网络拦截器
最后重新发送网络请求：
{
"headers":{
"content-length":"63",
"host":"192.168.253.200:8080",
"client":"Android Client",
"content-type":"application/x-www-form-urlencoded",
"connection":"Keep-Alive",
"accept-encoding":"gzip",
"master":"china"
},
"header":"123459",
"master":"usa",
"token":"388298a0c89f4a38b2fed4cd4123d441"
}
说明：接口postParam是返回请求所有参数和请求头信息。代码就不展示出来了。
