为什么Android模拟器无法从在线服务器访问API？

Question

I'm facing a problem which is my App can access API from iOS simulator but it doesn't on Android emulator .
I call the API like this :

async fetchData() {    
    let url = `http://1**.***.***.***/bla/bla`;

    try{
        let response = await fetch(url,{
            headers: {
                'x-application-id':'123',
                'hashing': this.hashGenerator("message"),
                'content-type': 'application/json'
            },
            method: "POST",
            body: JSON.stringify({
                "location":"city"
            })
        });
        if(!response.ok){
            throw new Error(response.status)
        } else {
            return await response.json();
        }
    } catch(error) {
        this.setState({ loadingList: false });
    }
}

Is it because I use http instead of https ?
I've been stuck since yesterday...

Answer 1

For http requests, certificate signing is required. you can use the following code to trust all certificates for your app. As your app is using your server only, there should not be any security issue using this code.

public void trustAllCertificates() {
    try {
        TrustManager[] trustAllCerts = new TrustManager[]{
            new X509TrustManager() {
                public X509Certificate[] getAcceptedIssuers() {
                    X509Certificate[] myTrustedAnchors = new X509Certificate[0];
                    return myTrustedAnchors;
                }

                @Override
                public void checkClientTrusted(X509Certificate[] certs, String authType) {
                }

                @Override
                public void checkServerTrusted(X509Certificate[] certs, String authType) {
                }
            }
        };

    SSLContext sc = SSLContext.getInstance("SSL");
    sc.init(null, trustAllCerts, new SecureRandom());
    HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
    HttpsURLConnection.setDefaultHostnameVerifier(new HostnameVerifier() {
        @Override
        public boolean verify(String arg0, SSLSession arg1) {
            return true;
        }
    });
    } catch (Exception e) {
    }
}

Just call this function in your Application class or in your main Activity .