title: unable to find valid certification path to requested target - Flutter
body: <p>I created a new Application in Flutter. I try to run that application on Android Mobile. It shows below Error.</p>
  <pre><code>  &quot;Exception in thread &quot;main&quot; javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at sun.security.ssl.Alerts.getSSLException(Alerts.java:192)
  at sun.security.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1946)
  at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:316)
  at sun.security.ssl.Handshaker.fatalSE(Handshaker.java:310)
  at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1639)
  at sun.security.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:223)
  at sun.security.ssl.Handshaker.processLoop(Handshaker.java:1037)
  at sun.security.ssl.Handshaker.process_record(Handshaker.java:965)
  at sun.security.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:1064)
  at sun.security.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1367)
  at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1395)
  at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1379)
  at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
  at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:185)
  at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1570)
  at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
  at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:268)
  at org.gradle.wrapper.Download.downloadInternal(Download.java:58)
  at org.gradle.wrapper.Download.download(Download.java:44)
  at org.gradle.wrapper.Install$1.call(Install.java:61)
  at org.gradle.wrapper.Install$1.call(Install.java:48)
  at org.gradle.wrapper.ExclusiveFileAccessManager.access(ExclusiveFileAccessManager.java:65)
  at org.gradle.wrapper.Install.createDist(Install.java:48)
  at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:128)
  at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:61)
  Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:450)
  at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:317)
  at sun.security.validator.Validator.validate(Validator.java:262)
  at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:330)
  at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:237)
  at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:132)
  at sun.security.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1621)
  ... 20 more
  Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
  at sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)
  at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)
  at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)
  at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:445)
  ... 26 more
  Exception: Gradle task assembleDebug failed with exit code 1&quot;
  </code></pre>
  <p>But when I tried to run the same in Chrome or Edge(Web Device). It is running.</p>