code: private String checkScheme(String scheme) {
          // NOTE: OkHttp can not understand blip/blips
          if (scheme.equalsIgnoreCase(C4Replicator.C4_REPLICATOR_SCHEME_2)) { return WEBSOCKET_SCHEME; }
  
          if (scheme.equalsIgnoreCase(C4Replicator.C4_REPLICATOR_TLS_SCHEME_2)) {
              return WEBSOCKET_SECURE_CONNECTION_SCHEME;
          }
  
          return scheme;
      }
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