Method addMetadata

okhttp/src/main/java/io/grpc/okhttp/Headers.java:134–146

(List<Header> okhttpHeaders, Metadata toAdd)

  }

  private static List<Header> addMetadata(List<Header> okhttpHeaders, Metadata toAdd) {
    byte[][] serializedHeaders = TransportFrameUtil.toHttp2Headers(toAdd);
    for (int i = 0; i < serializedHeaders.length; i += 2) {
      ByteString key = ByteString.of(serializedHeaders[i]);
      // Don't allow HTTP/2 pseudo headers to be added by the application.
      if (key.size() == 0 || key.getByte(0) == ':') {
        continue;
      }
      ByteString value = ByteString.of(serializedHeaders[i + 1]);
      okhttpHeaders.add(new Header(key, value));
    }
    return okhttpHeaders;
  }

  /** Strips all non-pseudo headers reserved by gRPC, to avoid duplicates and misinterpretation. */
  private static void stripNonApplicationHeaders(Metadata headers) {