okHTTP3返回SSLHandshakeException：握手失败

Question

[该函数应在目录中循环，并将从android API 28模拟器找到的每个图像发布到Flask后端服务器，它们都在本地运行（从模拟器调用API：https://10.0.2.2:5000/upload。]]

Android logcat：

2020-03-18 15:51:29.417 8687-8940/com.screenomics E/MainActivity: Request{method=POST, url=https://10.0.2.2:5000/upload, tags={}}
2020-03-18 15:51:29.446 8687-8940/com.screenomics W/System.err: javax.net.ssl.SSLHandshakeException: Handshake failed
2020-03-18 15:51:29.446 8687-8940/com.screenomics W/System.err:     at com.android.org.conscrypt.ConscryptFileDescriptorSocket.startHandshake(ConscryptFileDescriptorSocket.java:286)
2020-03-18 15:51:29.446 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.connection.RealConnection.connectTls(RealConnection.java:320)
2020-03-18 15:51:29.446 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.connection.RealConnection.establishProtocol(RealConnection.java:284)
2020-03-18 15:51:29.447 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.connection.RealConnection.connect(RealConnection.java:169)
2020-03-18 15:51:29.447 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.connection.StreamAllocation.findConnection(StreamAllocation.java:257)
2020-03-18 15:51:29.447 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.connection.StreamAllocation.findHealthyConnection(StreamAllocation.java:135)
2020-03-18 15:51:29.447 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.connection.StreamAllocation.newStream(StreamAllocation.java:114)
2020-03-18 15:51:29.447 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:42)
2020-03-18 15:51:29.448 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
2020-03-18 15:51:29.448 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
2020-03-18 15:51:29.448 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:94)
2020-03-18 15:51:29.448 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
2020-03-18 15:51:29.448 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
2020-03-18 15:51:29.449 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
2020-03-18 15:51:29.450 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
2020-03-18 15:51:29.450 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:125)
2020-03-18 15:51:29.450 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
2020-03-18 15:51:29.451 8687-8940/com.screenomics W/System.err:     at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
2020-03-18 15:51:29.451 8687-8940/com.screenomics W/System.err:     at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:264)
2020-03-18 15:51:29.451 8687-8940/com.screenomics W/System.err:     at okhttp3.RealCall.execute(RealCall.java:93)
Flask控制台：

127.0.0.1 - - [18/Mar/2020 15:51:30] code 400, message Bad request version ('À')
127.0.0.1 - - [18/Mar/2020 15:51:30] "   bñ³m¸È6ÁÝw^ëñÓëzߨX<.öúHÀ+Ì©À  À
" HTTPStatus.BAD_REQUEST -
上传功能

    private class UploadImage2 extends AsyncTask<Void, Void, Void> {
        private final MediaType PNG = MediaType.parse("image/*");
        private ConnectionSpec spec = new ConnectionSpec.Builder(ConnectionSpec.COMPATIBLE_TLS)
                .tlsVersions(TlsVersion.TLS_1_2, TlsVersion.TLS_1_1, TlsVersion.TLS_1_0)
                .cipherSuites(
                        CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
                        CipherSuite.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256,
                        CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
                        CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA)
                .build();
        private OkHttpClient.Builder client = new OkHttpClient.Builder()
                .connectionSpecs(Collections.singletonList(spec));
        private String dirpath;

        private String post(File file) {
            RequestBody body = new MultipartBody.Builder()
                    .setType(MultipartBody.FORM)
                    .addFormDataPart("file", file.getName(),
                            RequestBody.create(PNG, file))
                    .build();
            Request request = new Request.Builder()
                    .header("Content-Type", "multipart/form-data")
                    .url(SERVER_ADDRESS)
                    .post(body)
                    .build();
            try {
                Log.e(TAG, request.toString());
                Response response = client.build().newCall(request).execute();
                Log.e(TAG, response.toString());
                return response.body().toString();
            } catch (Exception e) {
                e.printStackTrace();
                return e.toString();
            }
        }

        UploadImage2(String dirpath) {
            this.dirpath = dirpath;
        }

        @Override
        protected void onPreExecute() {}

        @Override
        protected Void doInBackground(Void... params) {
            File dir = new File(dirpath);
            if (dir.exists()) {
                File[] files = dir.listFiles();
                if (files != null) {
                    for (File file : files) {
                        try {
                            String response = post(file);
                            Toast.makeText(getApplicationContext(), "Upload successful: " + response, Toast.LENGTH_SHORT).show();
                            Log.e(TAG, response);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
                return null;
            }
            Log.e(TAG, "directory not found");
            return null;        }
    }
此行Response response = client.build().newCall(request).execute();
发生错误

请帮助！谢谢！

[该函数应在目录中循环，并将从android API 28模拟器找到的每个图像发布到Flask后端服务器，两者均在本地运行（从模拟器调用API：https：//10.0.2.2：...

Answer 1

这是不安全的OkHttpClient，被广泛用作解决方法。