oven-sh/bun

Misleading error message "URL must not be a blank string" when URL is a non-string value which does not stringify to a fully valid URL with a hostname

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#21,361 建立於 2025年7月24日

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 (6 留言) (1 反應) (0 負責人)Rust (90,348 star) (4,486 fork)batch import
bugconfirmed buggood first issueweb:fetch

描述

What version of Bun is running?

1.2.18+0d4089ea7

What platform is your computer?

Darwin 24.3.0 arm64 arm

What steps can reproduce the bug?

Any of the following (and more):

await fetch(undefined)
await fetch(123)
await fetch({toString() {return `/some_path`}})

What is the expected behavior?

Something more precise, like:

fetch() URL must have a hostname

What do you see instead?

fetch() URL must not be a blank string

Additional information

Link to offending line in Bun sources: https://github.com/oven-sh/bun/blob/bd232189b4c39ac3c8ccef9cf0932407d65c527a/src/bun.js/webcore/fetch.zig#L1448

貢獻者指南

技術棧
javascript
領域
backenddeveloper experience
議題類型
bug
難度面向新貢獻者的預計實作難度，1 表示很小改動，5 表示專家級工作。
2
預計時間有經驗貢獻者完成調查、實作、測試並準備 pull request 的粗略時間範圍。
1-3 hours
活動狀態議題目前的可參與程度：新鮮、活躍、陳舊、阻塞或等待維護者輸入。
fresh
清晰度議題是否清楚說明預期改動、驗收標準和下一步。
clear
前置要求
Understanding of Zig programmingFamiliarity with Bun's build systemBasic knowledge of JavaScript fetch API
新手友善度1-100 的估計分數，表示該議題對首次貢獻者的友善程度。
75
研究方向
The issue is clearly described with the offending line at src/bun.js/webcore/fetch.zig:1448. The fix involves changing the error message string to be more specific about the URL missing a hostname. The contributor should examine the URL validation logic in that file to understand how the error is generated and ensure the new message is accurate. No linked PRs or additional comments provide further guidance.