helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/ResourceAccessor.java [407:425]:
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      @PathParam("resourceName") String resourceName, @QueryParam("command") String commandStr,
      String content) {
    Command command;
    if (commandStr == null || commandStr.isEmpty()) {
      command = Command.update; // Default behavior to keep it backward-compatible
    } else {
      try {
        command = getCommand(commandStr);
      } catch (HelixException ex) {
        return badRequest(ex.getMessage());
      }
    }

    ZNRecord record;
    try {
      record = toZNRecord(content);
    } catch (IOException e) {
      _logger.error("Failed to deserialize user's input " + content + ", Exception: " + e);
      return badRequest("Input is not a valid ZNRecord!");
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helix-rest/src/main/java/org/apache/helix/rest/server/resources/helix/ResourceAccessor.java [478:496]:
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      @PathParam("resourceName") String resourceName, @QueryParam("command") String commandStr,
      String content) {
    Command command;
    if (commandStr == null || commandStr.isEmpty()) {
      command = Command.update; // Default behavior is update
    } else {
      try {
        command = getCommand(commandStr);
      } catch (HelixException ex) {
        return badRequest(ex.getMessage());
      }
    }

    ZNRecord record;
    try {
      record = toZNRecord(content);
    } catch (IOException e) {
      _logger.error("Failed to deserialize user's input " + content + ", Exception: " + e);
      return badRequest("Input is not a valid ZNRecord!");
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