bug:

### Checks

- [x] I have searched [github.com/aws/amazon-q-developer-cli/issues](https://github.com/aws/amazon-q-developer-cli/issues?q=) and there are no duplicates of my issue
- [x] I have run `q doctor` in the affected terminal session
- [x] I have run `q restart` and replicated the issue again

### Operating system

Windows 11

### Expected behaviour

Amazon Q to work properly

### Actual behaviour

For many months now I can't use amazon Q on intelliJ
I tried to uninstall amazonQ and amz-core plugin a few times with no succes.
The amazon Q chat is blocked on "working..." when I type something and code whisperer keep on "loading" with no success.
So when I start intelliJ I got ~100 exception that looks like this :

`java.lang.IllegalStateException: Missing header Content-Length in input "}}Content-Length: 171

"
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:94)
at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:114)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
`

Or

`java.lang.IllegalStateException: Missing header Content-Length in input "{"jsonrpc":"2.0","method":"window/logMessage","params":{"type":2,"message":"[2025-11-05T10:04:58.783Z] lserver: Agent config not found at c:\\Users\\f3j7mo\\git\\taoimm\\040_Realisation\\Developpement\\taoimm\\tao-imm-web\\.amazonq\\agents\\default.json, skipping."}}Content-Length: 194

"
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:94)
at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:114)
at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
at java.base/java.lang.Thread.run(Thread.java:1583)
`

### Steps to reproduce

_No response_

### Environment

```yaml
Windows 11
Amazon Q 3.97.251
IntelliJ IDEA 2025.1.7 (but doesn't work from 2024)
```

Inizia con l’integrazione IntelliJ e gli errori LSP mostrati nell’issue, quindi riproduci il comportamento su Windows 11 utilizzando le versioni elencate di Amazon Q e IntelliJ. Esegui `q doctor` e `q restart` nella sessione del terminale interessata e verifica se la chat si arresta su “working...” e CodeWhisperer su “loading”; il lavoro è completato quando l’integrazione funziona senza le eccezioni Content-Length segnalate.

Scritto dal modello di indicizzazione a partire dal testo della issue.