Program: 11968
Project: 11968
Buggy source:
public String handleHTTPGet(HTTPRequest request) throws PluginHTTPException {
  boolean clientIsHtml=isClientHtml(request);
  String urlParam=request.getParam("String_Node_Str","String_Node_Str");
  if (urlParam.isEmpty()) {
    return "String_Node_Str";
  }
 else   if (Pattern.matches("String_Node_Str",urlParam)) {
    return "String_Node_Str";
  }
  FreenetURI calculatedUSK=null;
  try {
    calculatedUSK=URLtoUSKTools.computeUSKfromURL(urlParam,CENOClient.bridgeKey);
  }
 catch (  Exception e) {
    return "String_Node_Str";
  }
  String localFetchResult=null;
  ClientGetSyncCallback getSyncCallback=new ClientGetSyncCallback();
  try {
    CENOClient.nodeInterface.localFetchURI(calculatedUSK,getSyncCallback);
  }
 catch (  FetchException e) {
    e.printStackTrace();
  }
  localFetchResult=getSyncCallback.getResult(5L,TimeUnit.SECONDS);
  if (localFetchResult == null) {
    ulprStatus urlULPRStatus=ULPRManager.lookupULPR(urlParam);
    if (urlULPRStatus == ulprStatus.failed) {
      RequestSender.requestFromBridge(urlParam);
      if (clientIsHtml) {
        return printStaticHTMLReplace("String_Node_Str","String_Node_Str",urlParam);
      }
 else {
        JSONObject jsonResponse=new JSONObject();
        jsonResponse.put("String_Node_Str",true);
        jsonResponse.put("String_Node_Str","String_Node_Str");
        return jsonResponse.toJSONString();
      }
    }
 else {
      if (clientIsHtml) {
        return printStaticHTMLReplace("String_Node_Str","String_Node_Str",urlParam);
      }
 else {
        JSONObject jsonResponse=new JSONObject();
        jsonResponse.put("String_Node_Str",false);
        return jsonResponse.toJSONString();
      }
    }
  }
 else {
    if (clientIsHtml) {
      return localFetchResult;
    }
 else {
      JSONObject jsonResponse=new JSONObject();
      jsonResponse.put("String_Node_Str","String_Node_Str");
      jsonResponse.put("String_Node_Str",true);
      jsonResponse.put("String_Node_Str",localFetchResult);
      return jsonResponse.toJSONString();
    }
  }
}

Fixed version (ground truth):
public String handleHTTPGet(HTTPRequest request) throws PluginHTTPException {
  boolean clientIsHtml=isClientHtml(request);
  String urlParam=request.getParam("String_Node_Str","String_Node_Str");
  if (urlParam.isEmpty()) {
    return returnErrorJSON(new CENOException(CENOErrCode.LCS_HANDLER_INVALID_URL));
  }
 else   if (urlParam.startsWith("String_Node_Str")) {
    urlParam=urlParam.replace("String_Node_Str","String_Node_Str");
  }
  if (Pattern.matches("String_Node_Str",urlParam)) {
    return returnErrorJSON(new CENOException(CENOErrCode.LCS_HANDLER_INVALID_URL));
  }
  FreenetURI calculatedUSK=null;
  try {
    calculatedUSK=URLtoUSKTools.computeUSKfromURL(urlParam,CENOClient.bridgeKey);
  }
 catch (  Exception e) {
    return returnErrorJSON(new CENOException(CENOErrCode.LCS_HANDLER_INVALID_URL));
  }
  String localFetchResult=null;
  ClientGetSyncCallback getSyncCallback=new ClientGetSyncCallback();
  try {
    CENOClient.nodeInterface.localFetchURI(calculatedUSK,getSyncCallback);
  }
 catch (  FetchException e) {
    e.printStackTrace();
  }
  localFetchResult=getSyncCallback.getResult(5L,TimeUnit.SECONDS);
  if (localFetchResult == null) {
    ulprStatus urlULPRStatus=ULPRManager.lookupULPR(urlParam);
    RequestSender.requestFromBridge(urlParam);
    if (urlULPRStatus == ulprStatus.failed) {
      if (clientIsHtml) {
        return printStaticHTMLReplace("String_Node_Str","String_Node_Str",urlParam);
      }
 else {
        JSONObject jsonResponse=new JSONObject();
        jsonResponse.put("String_Node_Str",true);
        jsonResponse.put("String_Node_Str","String_Node_Str");
        return jsonResponse.toJSONString();
      }
    }
 else {
      if (clientIsHtml) {
        return printStaticHTMLReplace("String_Node_Str","String_Node_Str",urlParam);
      }
 else {
        JSONObject jsonResponse=new JSONObject();
        jsonResponse.put("String_Node_Str",false);
        return jsonResponse.toJSONString();
      }
    }
  }
 else {
    if (clientIsHtml) {
      return localFetchResult;
    }
 else {
      JSONObject jsonResponse=new JSONObject();
      jsonResponse.put("String_Node_Str","String_Node_Str");
      jsonResponse.put("String_Node_Str",true);
      jsonResponse.put("String_Node_Str",localFetchResult);
      return jsonResponse.toJSONString();
    }
  }
}