René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Polling transport malformed request body on large requests","articleBody":"Received this error when sending large text content via polling transport:\r\n```\r\nWARN  [2021-12-14 09:31:35,188] io.socket.parser.IOParser: An error occured while retrieving data from JSONTokener\r\n! org.json.JSONException: Unterminated string at 7675 [character 7676 line 1]\r\n! at org.json.JSONTokener.syntaxError(JSONTokener.java:507)\r\n! at org.json.JSONTokener.nextString(JSONTokener.java:320)\r\n! at org.json.JSONTokener.nextValue(JSONTokener.java:428)\r\n! at org.json.JSONObject.\u003cinit\u003e(JSONObject.java:233)\r\n! at org.json.JSONTokener.nextValue(JSONTokener.java:431)\r\n! at org.json.JSONObject.\u003cinit\u003e(JSONObject.java:252)\r\n! at org.json.JSONTokener.nextValue(JSONTokener.java:431)\r\n! at org.json.JSONArray.\u003cinit\u003e(JSONArray.java:125)\r\n! at org.json.JSONTokener.nextValue(JSONTokener.java:434)\r\n! at io.socket.parser.IOParser$Decoder.decodeString(IOParser.java:183)\r\n! at io.socket.parser.IOParser$Decoder.add(IOParser.java:92)\r\n! at io.socket.socketio.server.SocketIoClient.lambda$setup$2(SocketIoClient.java:161)\r\n! at io.socket.emitter.Emitter.emit(Emitter.java:123)\r\n! at io.socket.engineio.server.EngineIoSocket.emit(EngineIoSocket.java:185)\r\n! at io.socket.engineio.server.EngineIoSocket.onPacket(EngineIoSocket.java:397)\r\n! at io.socket.engineio.server.EngineIoSocket.lambda$setTransport$10(EngineIoSocket.java:300)\r\n! at io.socket.emitter.Emitter.emit(Emitter.java:123)\r\n! at io.socket.engineio.server.Transport.onPacket(Transport.java:104)\r\n! at io.socket.engineio.server.transport.Polling.lambda$onData$1(Polling.java:197)\r\n! at io.socket.engineio.parser.ParserV4.decodePayload(ParserV4.java:95)\r\n! at io.socket.engineio.server.transport.Polling.onData(Polling.java:192)\r\n! at io.socket.engineio.server.transport.Polling.onDataRequest(Polling.java:282)\r\n! at io.socket.engineio.server.transport.Polling.onRequest(Polling.java:99)\r\n! at io.socket.engineio.server.EngineIoSocket.onRequest(EngineIoSocket.java:213)\r\n! at io.socket.engineio.server.EngineIoServer.handleRequest(EngineIoServer.java:168)\r\n! at app.servlets.SocketIoServlet.service(SocketIoServlet.java:37)\r\n```\r\n\r\nSeems that using `inputStream.read()` in `io.socket.engineio.server.transport.Polling.onDataRequest` to stringify a large request body malforms the string.\r\n\r\nReplacing \r\n```java\r\n//noinspection ResultOfMethodCallIgnored\r\ninputStream.read(mReadBuffer, 0, mReadBuffer.length);\r\n```\r\nwith\r\n```java\r\ninputStream.readLine(mReadBuffer, 0, mReadBuffer.length);\r\n```\r\nproduced a valid string.\r\n\r\nAlternatively, using a `BufferedReader` with `request.getReader()` seemed to work too. \r\n```java\r\nStringBuilder buffer = new StringBuilder();\r\nBufferedReader reader = request.getReader();\r\nString line;\r\nwhile ((line = reader.readLine()) != null) {\r\n    buffer.append(line);\r\n    buffer.append(System.lineSeparator());\r\n}\r\nString data = buffer.toString()\r\n```","author":{"url":"https://github.com/Lahe","@type":"Person","name":"Lahe"},"datePublished":"2022-04-07T14:33:30.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/49/engine.io-server-java/issues/49"}