WebSocketException: The header part of a frame could not be read.

[starfi5h]

This seems to report by some players. They can join for the first time, but on the second time they can't join and stuck on loading factory message.
I finally found a way to reproduce it, at least on my machine.

1. Create a large fake payload on FactoryData packet. I created a byte array of 100MB.
2. Let client login by ngrok address to simulate bad network condition.
3. Let host move around or do some stuff after sending FactoryData packet to client. The client will error after a period and disconnet.

Client log:

[Info   :NebulaMultiplayerMod] Requested factory for planet Alpheratz III号星 (ID: 103) from host
[Debug  :NebulaMultiplayerMod] Packet Sent: FactoryLoadRequest
[Warning:NebulaMultiplayerMod] 2022/6/7 上午 12:04:37|Fatal|<>c__DisplayClass174_0.<startReceiving>b__2:0|WebSocketSharp.WebSocketException: The header part of a frame could not be read.
                             at WebSocketSharp.WebSocketFrame.processHeader (System.Byte[] header) [0x0001f] in <a2974eceb86942248aa42ebfa46be6d0>:IL_001F 
                             at WebSocketSharp.WebSocketFrame+<>c__DisplayClass71_0.<readHeaderAsync>b__0 (System.Byte[] bytes) [0x00001] in <a2974eceb86942248aa42ebfa46be6d0>:IL_0001 
                             at WebSocketSharp.Ext+<>c__DisplayClass54_0.<ReadBytesAsync>b__0 (System.IAsyncResult ar) [0x0008e] in <a2974eceb86942248aa42ebfa46be6d0>:IL_008E 
[Info   :NebulaMultiplayerMod] 2022/6/7 上午 12:04:37|Debug|WebSocket.closeHandshake:0|Was clean?: False
                             sent: False
                             received: False

Host log:

[Debug  :NebulaMultiplayerMod] Packet Received: FactoryLoadRequest
[Info   :NebulaMultiplayerMod] Sent 1050157 bytes of data for PlanetFactory Alpheratz III号星 (ID: 103)
[Debug  :NebulaMultiplayerMod] Packet Sent: FactoryData
[Debug  :NebulaMultiplayerMod] Packet Sent: VegeMinedPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: VegeMinedPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: GameHistoryResearchUpdatePacket
[Debug  :NebulaMultiplayerMod] Packet Sent: CreatePrebuildsRequest
[Debug  :NebulaMultiplayerMod] Packet Sent: NewDroneOrderPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: VegeMinedPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: GameHistoryResearchUpdatePacket
[Debug  :NebulaMultiplayerMod] Packet Sent: BuildEntityRequest
[Debug  :NebulaMultiplayerMod] Packet Sent: VegeMinedPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: PlayerSandCount
[Debug  :NebulaMultiplayerMod] Packet Sent: NewDroneOrderPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: GameHistoryResearchUpdatePacket
[Debug  :NebulaMultiplayerMod] Packet Sent: CreatePrebuildsRequest
[Debug  :NebulaMultiplayerMod] Packet Sent: NewDroneOrderPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: GameHistoryResearchUpdatePacket
[Debug  :NebulaMultiplayerMod] Packet Sent: BuildEntityRequest
[Debug  :NebulaMultiplayerMod] Packet Sent: VegeMinedPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: VegeMinedPacket
[Debug  :NebulaMultiplayerMod] Packet Sent: PlayerSandCount
[Debug  :NebulaMultiplayerMod] Packet Sent: NewDroneOrderPacket
[Info   :NebulaMultiplayerMod] 2022/6/7 上午 12:04:34|Debug|WebSocket.closeHandshake:0|Was clean?: False
                             sent: False
                             received: False
[Info   :NebulaMultiplayerMod] Client disconnected: ef000229256142359b4c32abf5b3c0dc, reason: 
[Warning:NebulaMultiplayerMod] 2022/6/7 上午 12:04:34|Error|WebSocket.send:0|The connection is closing.
[Info   :NebulaMultiplayerMod] Client disconnected because of an error: ef000229256142359b4c32abf5b3c0dc, reason: 
[Warning:NebulaMultiplayerMod] 2022/6/7 上午 12:04:34|Fatal|<>c__DisplayClass174_0.<startReceiving>b__2:0|System.ObjectDisposedException: Cannot access a disposed object.
                           Object name: 'System.Net.Sockets.NetworkStream'.
                             at System.Net.Sockets.NetworkStream.EndRead (System.IAsyncResult asyncResult) [0x00015] in <0813754e7cfa415ebfedff172c2dd6e0>:IL_0015 
                             at WebSocketSharp.Ext+<>c__DisplayClass54_0.<ReadBytesAsync>b__0 (System.IAsyncResult ar) [0x00002] in <a2974eceb86942248aa42ebfa46be6d0>:IL_0002 
[Warning:NebulaMultiplayerMod] 2022/6/7 上午 12:04:34|Error|WebSocket.send:0|The connection is closing.
[Info   :NebulaMultiplayerMod] Client disconnected because of an error: ef000229256142359b4c32abf5b3c0dc, reason: 
[Info   :NebulaMultiplayerMod] 2022/6/7 上午 12:04:34|Info |WebSocket.close:0|The connection has already been closed.
[Warning:NebulaMultiplayerMod] Cannot send packet to a Closed connection 3363
[Debug  :BulletTime] Exit pause mode, duration: 768 ticks.
[Warning:NebulaMultiplayerMod] PlayerDisconnected NOT CALLED!
[Warning:NebulaMultiplayerMod] PlayerDisconnected NOT CALLED!
[Info   :NebulaMultiplayerMod] Updated Discord activity

[JamzOJamz]

I'm using websocket-sharp in my own Bepinex project and getting the same error. It always happens after a variable amount of time, usually 5 minutes, when sending a message to the server. .. Did you guys ever find a fix? Thanks.

[starfi5h]

@JamzOhJamz In our case this seems to be related with WebSocketServiceManager.
Sometimes when sending a large fragments of packet, ping frame may not get respond within 1 sec (default value) if the network condition is not good, thus the session gets clean up by WebSocketServiceManager.
So I try to increase socket.WaitTime for server to avoid this situation, seems solved during my testing.

socket.KeepClean = true;
socket.WaitTime = TimeSpan.FromSeconds(20);