Document Lightpanda learnings and proxy notes
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Chen Gu
@@ -32,3 +32,38 @@ fetch failed
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## [ERR-20260326-002] lightpanda
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**Logged**: 2026-03-26T08:35:04Z
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**Priority**: high
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**Status**: pending
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**Area**: config
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### Summary
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Lightpanda 当前实例在访问多类站点时存在 SslConnectError、GotNothing 与连接被重置等稳定性问题
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### Error
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```
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Observed failures while driving Lightpanda via CDP on ws://127.0.0.1:9222/:
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- Navigation failedReason: SslConnectError
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- Navigation failedReason: GotNothing
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- ConnectionResetError: [Errno 54] Connection reset by peer
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- IncompleteReadError after session dropped during/after navigation
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```
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### Context
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- Operation attempted: 使用自写 CDP 探针连接本地 Lightpanda，访问 example.com、Google、Bing、DuckDuckGo、Wikipedia、lightpanda.io、Hacker News、GitHub、Baidu、Zhihu、Bilibili、docs.python.org、httpbin 等站点
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- Successful sample: example.com、cn.bing.com/search?q=lightpanda
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- Proxy finding: 本机 127.0.0.1:7890 不通；127.0.0.1:7897 可连接
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- Impact: 目前 Lightpanda 仅适合作为受限场景下的实验性浏览器后端，不能默认承担通用网页访问任务
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### Suggested Fix
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检查 Lightpanda 启动参数、代理设置、TLS/证书处理与日志输出；优先确认浏览器实例是否显式走 127.0.0.1:7897，并改为串行站点测试后再逐步扩大兼容范围。
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### Metadata
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- Reproducible: yes
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- Related Files: tmp/lightpanda_probe.py, tmp/lightpanda_nav.py, tmp/lightpanda_search.py, tmp/lightpanda_search_debug.py, tmp/lightpanda_probe_site.py
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- See Also: ERR-20260326-001
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---
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@@ -29,3 +29,30 @@
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---
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## [LRN-20260326-002] best_practice
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**Logged**: 2026-03-26T08:35:04Z
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**Priority**: high
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**Status**: pending
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**Area**: config
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### Summary
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使用 Lightpanda 做网页自动化时，应优先把它视为“待验证的特定站点浏览器”，而不是默认当作通用浏览器
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### Details
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在连接本地 9222 端口的 Lightpanda 实例后，已验证其支持基本 CDP 流程：可连接 websocket、创建 target、attach session、打开 example.com，并读取 document.title 与 document.body.innerText。同时也验证到站点兼容性非常不均匀：cn.bing.com 搜索页可正常加载并提取结果；但 Google 搜索会话会中途断开，DuckDuckGo、Wikipedia、lightpanda.io、Hacker News 等站点出现 SslConnectError，GitHub 及多站点并发探测时还出现 Connection reset by peer。由此可知，当前实例更适合单站点、串行、小范围验证，不适合直接假设为稳定的通用浏览器后端。
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### Suggested Action
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后续使用 Lightpanda 时，先用一小组目标站点做串行兼容性验证并记录结果；默认优先使用已验证可用的站点（如 Bing），避免一开始并发探测或直接依赖复杂站点。
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### Metadata
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- Source: conversation
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- Related Files: tmp/lightpanda_probe.py, tmp/lightpanda_nav.py, tmp/lightpanda_probe_site.py
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- Tags: lightpanda, cdp, browser-automation, compatibility, best-practice
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- Pattern-Key: lightpanda.validate_target_sites_before_generalizing
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- Recurrence-Count: 1
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- First-Seen: 2026-03-26
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- Last-Seen: 2026-03-26
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---
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@@ -38,3 +38,18 @@ Skills are shared. Your setup is yours. Keeping them apart means you can update
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---
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Add whatever helps you do your job. This is your cheat sheet.
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## Network / Proxy
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- Current local HTTP proxy: `127.0.0.1:7897`
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- `127.0.0.1:7890` was checked on 2026-03-26 and was not accepting connections
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## Lightpanda
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- Local Lightpanda CDP endpoint observed at: `ws://127.0.0.1:9222/`
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- Current behavior snapshot (2026-03-26):
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- Basic CDP control works (connect / create target / navigate / evaluate JS)
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- `example.com` and Bing search were reachable in testing
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- Many other sites failed with `SslConnectError`, `GotNothing`, or session resets
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- Treat the current Lightpanda instance as **experimental and site-specific**, not a general-purpose browser by default
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- Prefer **serial, one-site-at-a-time validation** before depending on it for new browsing tasks
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