---
title: "Discussion on \"Claude Code 400 Recovery When cache_control Cannot Be Set for Empty Text Blocks: Keep Your Session\" | Hashnode"
description: "Discussion on \"Claude Code 400 Recovery When cache_control Cannot Be Set for Empty Text Blocks: Keep Your Session\". A Python script that surgically removes the corrupted block from your JSONL session file, plus the four input patterns that trigger it"
url: "https://hashnode.com/posts/claude-code-cache-control-empty-text-block-400-recovery/6a015eda1138639290b57274"
---

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# [Claude Code 400 Recovery When cache\_control Cannot Be Set for Empty Text Blocks: Keep Your Session](https://yurukusa.hashnode.dev/claude-code-cache-control-empty-text-block-400-recovery?utm_source=hashnode&utm_medium=feed)

A Python script that surgically removes the corrupted block from your JSONL session file, plus the four input patterns that trigger it

May 11 · 7 min read · yurukusa.hashnode.dev  
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## Written by

[yurukusa](https://hashnode.com/@yurukusa)

@yurukusa

  
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Building free developer tools. 56 browser-based tools, all single HTML files.

Building free developer tools. 56 browser-based tools, all single HTML files. No npm, no build step.

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