Transport Security has Blocked a cleartext HTTP

Transport Security has Blocked a cleartext HTTP.xml

For example you can add a specific domain like:
<key>NSAppTransportSecurity</key>
<dict>
  <key>NSExceptionDomains</key>
  <dict>
    <key>yourserver.com</key>
    <dict>
      <!--Include to allow subdomains-->
      <key>NSIncludesSubdomains</key>
      <true/>
      <!--Include to allow HTTP requests-->
      <key>NSTemporaryExceptionAllowsInsecureHTTPLoads</key>
      <true/>
      <!--Include to specify minimum TLS version-->
      <key>NSTemporaryExceptionMinimumTLSVersion</key>
      <string>TLSv1.1</string>
    </dict>
  </dict>
</dict>

The lazy option is:
    <key>NSAppTransportSecurity</key>
    <dict>
        <!--Include to allow all connections (DANGER)-->
        <key>NSAllowsArbitraryLoads</key>
        <true/>
    </dict>