使用 okHttp 握手失败，但使用 HttpURLConnection 工作

Question

我正在尝试向服务器发送 get 请求（发送 get 请求进行测试，实际上我需要向同一台服务器发送 post 请求。如果 get 有效，post 将有效）

到服务器的链接是 https://bits-bosm.org/2017/registrations/signup/

问题是当我使用 okHttp 发送请求时，我收到一个失败响应，说握手失败。

这是我使用 okHttp（在 kotlin 中）发送请求的代码

val request = Request.Builder()
            .url("https://bits-bosm.org/2017/registrations/signup/")
            .build()

    okHttpClient.newCall(request).enqueue(object : Callback {
        override fun onFailure(call: Call?, e: IOException?) {
            val mMessage = e?.message?.toString()
            Log.w("failure Response", mMessage)
        }

        override fun onResponse(call: Call?, response: Response?) {
            val mMessage = response?.body()?.string()
            Log.e("Message", mMessage)
        }
    })

但如果我使用 HttpUrlConnection 将 get 请求发送到同一台服务器，我会得到响应。

这是相同的代码（java）

private static final String USER_AGENT = "Mozilla/5.0";

private static final String GET_URL = "https://bits-bosm.org/2017/registrations/signup/";



static void sendGET() throws IOException {
    URL obj = new URL(GET_URL);
    HttpURLConnection con = (HttpURLConnection) obj.openConnection();
    con.setRequestMethod("GET");
    con.setRequestProperty("User-Agent", USER_AGENT);
    int responseCode = con.getResponseCode();
    System.out.println("GET Response Code :: " + responseCode);
    if (responseCode == HttpURLConnection.HTTP_OK) { // success
        BufferedReader in = new BufferedReader(new InputStreamReader(
                con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        // print result
        Log.e("Result", response.toString());
    } else {
        System.out.println("GET request not worked");
    }

}

根据我在互联网上的搜索以及我可以推断的内容，问题是该站点是使用自我证书签名的，而 okHttp 不允许它们。我什至尝试使用我在 Internet 上找到的代码 sn-ps，它不检查证书（自定义 SSLSocketFactory）和其他一些解决方案，但它们都不起作用。我现在也不关心安全性，我只想让它工作。但我无法访问后端，也无法更改/删除 ssl 安全性。

怎样才能让它发挥作用？有什么我想念的吗？

Answer 1

这是广泛用作解决方法的不安全 OkHttpClient。

不要在生产中使用它，它仅用于开发目的。

import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import okhttp3.OkHttpClient;

public class Http {

    private final static String SSL = "SSL";

    private static OkHttpClient InsecureHttpClient;

    public static OkHttpClient client () {
        if (InsecureHttpClient == null) {
            try {
                InsecureHttpClient = insecureOkHttpClient ();
            } catch (Exception e) {
                e.printStackTrace ();
            }
        }

        return InsecureHttpClient;
    }

    private static OkHttpClient insecureOkHttpClient () throws Exception {
        TrustManager [] trustAllCerts       = new TrustManager [] { trustManager () };

        SSLContext sslContext               = SSLContext.getInstance (SSL);
        sslContext.init (null, trustAllCerts, new SecureRandom ());

        SSLSocketFactory sslSocketFactory   = sslContext.getSocketFactory ();

        OkHttpClient.Builder builder        = new OkHttpClient.Builder ();
        builder.sslSocketFactory (sslSocketFactory, (X509TrustManager)trustAllCerts [0]);
        builder.hostnameVerifier (hostnameVerifier ());

        return builder.build ();
    }

    private static TrustManager trustManager () {
        return new X509TrustManager () {

            @Override
            public void checkClientTrusted (X509Certificate [] chain, String authType) throws CertificateException {  }

            @Override
            public void checkServerTrusted (X509Certificate[] chain, String authType) throws CertificateException {  }

            @Override
            public X509Certificate [] getAcceptedIssuers () {
                return new X509Certificate [] {  };
            }
        };
    }

    private static HostnameVerifier hostnameVerifier () {
        return new HostnameVerifier () {

            @Override
            public boolean verify (String hostname, SSLSession session) {
                return true;
            }
        };
    }
}

然后您显然可以使用上面的客户端，例如以下测试代码：（顺便说一句，它适用于您的 url）

final Request request = new Request.Builder ()
    .url ("https://bits-bosm.org/2017/registrations/signup/")
    .get ()
    .addHeader ("Accept", "text/html")
    .build ();

final OkHttpClient httpClient = Http.client ();

new Thread (new Runnable () {

    @Override
    public void run () {
        try {
            Response response = httpClient.newCall (request).execute ();

            Logger.error (MainActivity.class.getSimpleName () + " --> Http Response", response.body ().string ());

        } catch (IOException e) {
            e.printStackTrace ();
        }
    }

}).start ();