Luau LSP does not process $/plugin/full requests with large payloads.

[ActualMasterOogway]

I noticed that when I used the Roblox Studio Companion Plugin the data which gets sent to the Luau LSP Extension wont do anything at all.
I wrote a script to reproduce this bug using Lune

local Port = 3667

local Network = require("@lune/net")

-- Big Body Data (Not working)
local Body = '{"tree":{"Children":{"3":{"Children":{"2":{"Children":[null,{"Children":[null,{"Children":[],"Name":"PlayerScriptsLoader","ClassName":"LocalScript"},{"Children":[null,{"Children":[null,{"Children":[],"Name":"DynamicThumbstick","ClassName":"ModuleScript"},{"Children":[],"Name":"VehicleController","ClassName":"ModuleScript"},{"Children":[],"Name":"ClickToMoveController","ClassName":"ModuleScript"},{"Children":[],"Name":"PathDisplay","ClassName":"ModuleScript"},{"Children":[],"Name":"VRNavigation","ClassName":"ModuleScript"},{"Children":[],"Name":"BaseCharacterController","ClassName":"ModuleScript"},{"Children":[],"Name":"Keyboard","ClassName":"ModuleScript"},{"Children":[],"Name":"Gamepad","ClassName":"ModuleScript"},{"Children":[],"Name":"TouchJump","ClassName":"ModuleScript"},{"Children":[],"Name":"ClickToMoveDisplay","ClassName":"ModuleScript"},{"Children":[],"Name":"TouchThumbstick","ClassName":"ModuleScript"}],"Name":"ControlModule","ClassName":"ModuleScript"},{"Children":[null,{"Children":[],"Name":"VRBaseCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"CameraUI","ClassName":"ModuleScript"},{"Children":[],"Name":"CameraInput","ClassName":"ModuleScript"},{"Children":[],"Name":"VRCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"Invisicam","ClassName":"ModuleScript"},{"Children":[],"Name":"BaseOcclusion","ClassName":"ModuleScript"},{"Children":[],"Name":"BaseCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"LegacyCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"OrbitalCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"ClassicCamera","ClassName":"ModuleScript"},{"Children":{"3":{"Children":[],"Name":"VehicleCameraCore","ClassName":"ModuleScript"},"2":{"Children":[],"Name":"VehicleCameraConfig","ClassName":"ModuleScript"}},"Name":"VehicleCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"CameraToggleStateController","ClassName":"ModuleScript"},{"Children":[],"Name":"CameraUtils","ClassName":"ModuleScript"},{"Children":{"2":{"Children":[],"Name":"Popper","ClassName":"ModuleScript"}},"Name":"ZoomController","ClassName":"ModuleScript"},{"Children":[],"Name":"VRVehicleCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"TransparencyController","ClassName":"ModuleScript"},{"Children":{"2":{"Children":[],"Name":"BoundKeys","ClassName":"StringValue"}},"Name":"MouseLockController","ClassName":"ModuleScript"},{"Children":[],"Name":"Poppercam","ClassName":"ModuleScript"}],"Name":"CameraModule","ClassName":"ModuleScript"},{"Children":[null,{"Children":[],"Name":"CharacterUtil","ClassName":"ModuleScript"},{"Children":[],"Name":"ConnectionUtil.spec","ClassName":"ModuleScript"},{"Children":[],"Name":"ConnectionUtil","ClassName":"ModuleScript"},{"Children":[],"Name":"FlagUtil","ClassName":"ModuleScript"}],"Name":"CommonUtils","ClassName":"Folder"}],"Name":"PlayerModule","ClassName":"ModuleScript"},{"Children":{"2":{"Children":[],"Name":"AtomicBinding","ClassName":"ModuleScript"}},"Name":"RbxCharacterSounds","ClassName":"LocalScript"}],"Name":"PlayerScripts","ClassName":"PlayerScripts"},{"Children":[],"Name":"PlayerGui","ClassName":"PlayerGui"},{"Children":[],"Name":"StarterGear","ClassName":"StarterGear"},{"Children":[],"Name":"Backpack","ClassName":"Backpack"}],"Name":"ImRealDani26","ClassName":"Player"}},"Name":"Players","ClassName":"Players"},"2":{"Children":[null,{"Children":[],"Name":"Camera","ClassName":"Camera"},{"Children":[],"Name":"Terrain","ClassName":"Terrain"},{"Children":[null,{"Children":[],"Name":"Shirt","ClassName":"Shirt"},{"Children":[null,{"Children":[],"Name":"Animator","ClassName":"Animator"},{"Children":[],"Name":"BodyTypeScale","ClassName":"NumberValue"},{"Children":[],"Name":"BodyProportionScale","ClassName":"NumberValue"},{"Children":[],"Name":"BodyWidthScale","ClassName":"NumberValue"},{"Children":[],"Name":"BodyHeightScale","ClassName":"NumberValue"},{"Children":[],"Name":"BodyDepthScale","ClassName":"NumberValue"},{"Children":[],"Name":"HeadScale","ClassName":"NumberValue"},{"Children":[null,{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"AccessoryDescription","ClassName":"AccessoryDescription"}],"Name":"HumanoidDescription","ClassName":"HumanoidDescription"},{"Children":[],"Name":"Status","ClassName":"Status"}],"Name":"Humanoid","ClassName":"Humanoid"},{"Children":[],"Name":"Health","ClassName":"Script"},{"Children":[null,{"Children":{"2":{"Children":[],"Name":"CheerAnim","ClassName":"Animation"}},"Name":"cheer","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"ClimbAnim","ClassName":"Animation"}},"Name":"climb","ClassName":"StringValue"},{"Children":[null,{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation1","ClassName":"Animation"},{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation2","ClassName":"Animation"},{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation3","ClassName":"Animation"}],"Name":"dance","ClassName":"StringValue"},{"Children":[null,{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation1","ClassName":"Animation"},{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation2","ClassName":"Animation"},{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation3","ClassName":"Animation"}],"Name":"dance2","ClassName":"StringValue"},{"Children":[null,{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation1","ClassName":"Animation"},{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation2","ClassName":"Animation"},{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation3","ClassName":"Animation"}],"Name":"dance3","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"FallAnim","ClassName":"Animation"}},"Name":"fall","ClassName":"StringValue"},{"Children":{"3":{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation2","ClassName":"Animation"},"2":{"Children":{"2":{"Children":[],"Name":"Weight","ClassName":"NumberValue"}},"Name":"Animation1","ClassName":"Animation"}},"Name":"idle","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"JumpAnim","ClassName":"Animation"}},"Name":"jump","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"LaughAnim","ClassName":"Animation"}},"Name":"laugh","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"PointAnim","ClassName":"Animation"}},"Name":"point","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"SitAnim","ClassName":"Animation"}},"Name":"sit","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"ToolLungeAnim","ClassName":"Animation"}},"Name":"toollunge","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"ToolNoneAnim","ClassName":"Animation"}},"Name":"toolnone","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"ToolSlashAnim","ClassName":"Animation"}},"Name":"toolslash","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"WaveAnim","ClassName":"Animation"}},"Name":"wave","ClassName":"StringValue"},{"Children":[],"Name":"ScaleDampeningPercent","ClassName":"NumberValue"},{"Children":{"2":{"Children":[],"Name":"RunAnim","ClassName":"Animation"}},"Name":"run","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"Swim","ClassName":"Animation"}},"Name":"swim","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"SwimIdle","ClassName":"Animation"}},"Name":"swimidle","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"WalkAnim","ClassName":"Animation"}},"Name":"walk","ClassName":"StringValue"},{"Children":[],"Name":"PlayEmote","ClassName":"BindableFunction"},{"Children":{"2":{"Children":[],"Name":"Animation1","ClassName":"Animation"}},"Name":"mood","ClassName":"StringValue"}],"Name":"Animate","ClassName":"LocalScript"},{"Children":[],"Name":"Body 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LSP","ClassName":"DataModel"}}'

-- Small Body Data (Working)
--local Body = '{"tree":{"Children":{"2":{"Children":{"2":{"Children":[],"Name":"ClientReplicator","ClassName":"ClientReplicator"}},"Name":"NetworkClient","ClassName":"NetworkClient"}},"Name":"Luau LSP","ClassName":"DataModel"}}'

print(Network.request{
    url = `http://localhost:{Port}/clear`,
    method = "POST",
    headers = {
        ["Content-Type"] = "application/json",
    }
}.body)

print(Network.request{
    url = `http://localhost:{Port}/full`,
    method = "POST",
    headers = {
        ["Content-Type"] = "application/json",
    },
    body = Body,
}.body)

I looked in the output console and it only recieved the $/plugin/clear method when working with a big data tree

[JohnnyMorganz]

Have you increased the luau-lsp.plugin.maximumRequestBodySize in VSCode?

[ActualMasterOogway]

Have you increased the luau-lsp.plugin.maximumRequestBodySize in VSCode?

Yes I set it to 2gb

[ActualMasterOogway]

I noticed that when I used the Roblox Studio Companion Plugin the data which gets sent to the Luau LSP Extension wont do anything at all. I wrote a script to reproduce this bug using Lune

local Port = 3667

local Network = require("@lune/net")

-- Big Body Data (Not working)
local Body = '{"tree":{"Children":{"3":{"Children":{"2":{"Children":[null,{"Children":[null,{"Children":[],"Name":"PlayerScriptsLoader","ClassName":"LocalScript"},{"Children":[null,{"Children":[null,{"Children":[],"Name":"DynamicThumbstick","ClassName":"ModuleScript"},{"Children":[],"Name":"VehicleController","ClassName":"ModuleScript"},{"Children":[],"Name":"ClickToMoveController","ClassName":"ModuleScript"},{"Children":[],"Name":"PathDisplay","ClassName":"ModuleScript"},{"Children":[],"Name":"VRNavigation","ClassName":"ModuleScript"},{"Children":[],"Name":"BaseCharacterController","ClassName":"ModuleScript"},{"Children":[],"Name":"Keyboard","ClassName":"ModuleScript"},{"Children":[],"Name":"Gamepad","ClassName":"ModuleScript"},{"Children":[],"Name":"TouchJump","ClassName":"ModuleScript"},{"Children":[],"Name":"ClickToMoveDisplay","ClassName":"ModuleScript"},{"Children":[],"Name":"TouchThumbstick","ClassName":"ModuleScript"}],"Name":"ControlModule","ClassName":"ModuleScript"},{"Children":[null,{"Children":[],"Name":"VRBaseCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"CameraUI","ClassName":"ModuleScript"},{"Children":[],"Name":"CameraInput","ClassName":"ModuleScript"},{"Children":[],"Name":"VRCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"Invisicam","ClassName":"ModuleScript"},{"Children":[],"Name":"BaseOcclusion","ClassName":"ModuleScript"},{"Children":[],"Name":"BaseCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"LegacyCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"OrbitalCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"ClassicCamera","ClassName":"ModuleScript"},{"Children":{"3":{"Children":[],"Name":"VehicleCameraCore","ClassName":"ModuleScript"},"2":{"Children":[],"Name":"VehicleCameraConfig","ClassName":"ModuleScript"}},"Name":"VehicleCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"CameraToggleStateController","ClassName":"ModuleScript"},{"Children":[],"Name":"CameraUtils","ClassName":"ModuleScript"},{"Children":{"2":{"Children":[],"Name":"Popper","ClassName":"ModuleScript"}},"Name":"ZoomController","ClassName":"ModuleScript"},{"Children":[],"Name":"VRVehicleCamera","ClassName":"ModuleScript"},{"Children":[],"Name":"TransparencyController","ClassName":"ModuleScript"},{"Children":{"2":{"Children":[],"Name":"BoundKeys","ClassName":"StringValue"}},"Name":"MouseLockController","ClassName":"ModuleScript"},{"Children":[],"Name":"Poppercam","ClassName":"ModuleScript"}],"Name":"CameraModule","ClassName":"ModuleScript"},{"Children":[null,{"Children":[],"Name":"CharacterUtil","ClassName":"ModuleScript"},{"Children":[],"Name":"ConnectionUtil.spec","ClassName":"ModuleScript"},{"Children":[],"Name":"ConnectionUtil","ClassName":"ModuleScript"},{"Children":[],"Name":"FlagUtil","ClassName":"ModuleScript"}],"Name":"CommonUtils","ClassName":"Folder"}],"Name":"PlayerModule","ClassName":"ModuleScript"},{"Children":{"2":{"Children":[],"Name":"AtomicBinding","ClassName":"ModuleScript"}},"Name":"RbxCharacterSounds","ClassName":"LocalScript"}],"Name":"PlayerScripts","ClassName":"PlayerScripts"},{"Children":[],"Name":"PlayerGui","ClassName":"PlayerGui"},{"Children":[],"Name":"StarterGear","ClassName":"StarterGear"},{"Children":[],"Name":"Backpack","ClassName":"Backpack"}],"Name":"ImRealDani26","ClassName":"Player"}},"Name":"Players","ClassName":"Players"},"2":{"Children":[null,{"Children":[],"Name":"Camera","ClassName":"Camera"},{"Children":[],"Name":"Terrain","ClassName":"Terrain"},{"Children":[null,{"Children":[],"Name":"Shirt","ClassName":"Shirt"},{"Children":[null,{"Children":[],"Name":"Animator","ClassName":"Animator"},{"Children":[],"Name":"BodyTypeScale","ClassName":"NumberValue"},{"Children":[],"Name":"BodyProportionScale","ClassName":"NumberValue"},{"Children":[],"Name":"BodyWidthScale","ClassName":"NumberValue"},{"Children":[],"Name":"BodyHeightScale","ClassName":"NumberValue"},{"Children":[],"Name":"BodyDepthScale","ClassName":"NumberValue"},{"Children":[],"Name":"HeadScale","ClassName":"NumberValue"},{"Children":[null,{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"BodyPartDescription","ClassName":"BodyPartDescription"},{"Children":[],"Name":"AccessoryDescription","ClassName":"AccessoryDescription"}],"Name":"HumanoidDescription","ClassName":"HumanoidDescription"},{"Children":[],"Name":"Status","ClassName":"Status"}],"Name":"Humanoid","ClassName":"Humanoid"},{"Children":[],"Name":"Health","ClassName":"Script"},{"Children":[null,{"Children":{"2":{"Children":[],"Name":"CheerAnim","ClassName":"Animation"}},"Name":"cheer","ClassName":"StringValue"},{"Children":{"2":{"Children":[],"Name":"ClimbAnim","Cl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LSP","ClassName":"DataModel"}}'

-- Small Body Data (Working)
--local Body = '{"tree":{"Children":{"2":{"Children":{"2":{"Children":[],"Name":"ClientReplicator","ClassName":"ClientReplicator"}},"Name":"NetworkClient","ClassName":"NetworkClient"}},"Name":"Luau LSP","ClassName":"DataModel"}}'

print(Network.request{
    url = `http://localhost:{Port}/clear`,
    method = "POST",
    headers = {
        ["Content-Type"] = "application/json",
    }
}.body)

print(Network.request{
    url = `http://localhost:{Port}/full`,
    method = "POST",
    headers = {
        ["Content-Type"] = "application/json",
    },
    body = Body,
}.body)

I looked in the output console and it only recieved the $/plugin/clear method when working with a big data tree

I forgot to mention that both of these requests return OK

[notpoiu]

Same here, the code from OP is basically identical to my code & its not working for me either

[notpoiu]

Are there any updates on this?

[JohnnyMorganz]

Found the error message in Developer Tools: Toggle Developer Console on VSCode rather than the output channel

Error is: 
{
    "code": -32603,
    "data": null,
    "message": "[json.exception.type_error.304] cannot use at() with null"
} 

[JohnnyMorganz]

Your big body data contains a lot of null children, which seems to be causing issues. Weird that these are showing up when using the studio companion plugin.

I wonder if it's related to the fact that your children seem to be named numbers, and this is not being encoded correctly EDIT: I misunderstood the JSON. It's not your children named numbers, its just the json encoded keys.

Almost as if this table insert is inserting nil, which seems impossible:

luau-lsp/plugin/src/init.server.lua

Line 123 in 048e2f2

table.insert(encoded.Children, encodeInstance(child))

[ActualMasterOogway]

Your big body data contains a lot of null children, which seems to be causing issues. Weird that these are showing up when using the studio companion plugin.

I wonder if it's related to the fact that your children seem to be named numbers, and this is not being encoded correctly EDIT: I misunderstood the JSON. It's not your children named numbers, its just the json encoded keys.

Almost as if this table insert is inserting nil, which seems impossible:

luau-lsp/plugin/src/init.server.lua

Line 123 in 048e2f2

table.insert(encoded.Children, encodeInstance(child))

Really weird behaviour. I tested out the new update and the issue was fixed but another issue came:

"Attempted to update plugin information for a non-DM instance"

Thats pretty weird since the information of the body datas are both DM instances

[ActualMasterOogway]

Connecting through the studio companion plugin also doesnt work