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fetch("http://host//a//b") sent "GET /a//b". The byte-slice URL
parser collapsed every leading "//" of pathname to one "/". The
WHATWG parser keeps them and so do node and curl. Remove the collapse
so the HTTP client sends the request-target as written.
`server.url` ends with `/`, so `${server.url}/path` is `http://host//path`.
fetch() sent that as `/path`. These tests now build the URL they name,
with `new URL("/path", server.url)`.
(cherry picked from commit d884a5d)
…THUB_API_DOMAIN
A registry typed as http://host//npm/ is requested as //npm/pkg, as
npm does. The token keyed to //host//npm/ is the one sent to it.
bun upgrade and bun create build https://{GITHUB_API_DOMAIN}/repos/...
A domain with a trailing slash wrote //repos, which the URL parser used
to hide. Trim the slash.
FileSystemRouter#match(url) reports the pathname as new URL() reads it.
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Updated 7:27 AM PT - Oct 22nd, 2026
✅ @robobun, your commit 55dc531b6fb817e511adc8f540caddc52a17f377 passed in 🧪 To try this PR locally: bunx bun-pr 45655That installs a local version of the PR into your bun-45655 --bun |
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WalkthroughURL handling now preserves repeated leading pathname slashes in parsing and request targets. The change also updates HTTP test URL construction and trims trailing slashes from the GitHub API domain override used by the create and upgrade commands. ChangesURL Path Handling
GitHub API Domain Override
Possibly related PRs
Suggested reviewers: Priority: ➖ Normal Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation |
|---|---|---|
| Linked Issues check |  |
Issue #45330 requires fetch() to preserve the URL pathname in the HTTP request-target. URL::parse_with no longer removes leading slashes from pathname. The new regression test checks HTTP/1.1 or… |
| Out of Scope Changes check | |
The changes remain connected to the pathname-preservation fix. href_without_auth preserves registry leading slashes and the npmrc tests verify registry requests and token keys. The GitHub API handli… |
| Title check | |
The title clearly summarizes the main change: preserving leading pathname slashes in HTTP request targets. |
| Description check | |
The description is detailed and covers the change, problem, fix, verification, and known impacts. It does not use the template headings exactly, but it provides the required information in equivalent … |
Full details: Linked Issues check
-
Explanation
Issue
#45330requiresfetch()to preserve the URL pathname in the HTTP request-target.URL::parse_withno longer removes leading slashes frompathname. The new regression test checks HTTP/1.1 origin form and proxy absolute form for repeated leading slashes and query strings. The added HTTP/2 and HTTP/3 tests also check preserved:pathvalues. The implementation satisfies the issue requirement.
Full details: Out of Scope Changes check
-
Explanation
The changes remain connected to the pathname-preservation fix.
href_without_authpreserves registry leading slashes and the npmrc tests verify registry requests and token keys. The GitHub API handling removes trailing separators that would otherwise produce duplicate separators after the parser change. The test URL rewrites prevent existing tests from depending on the old slash collapse. These changes support the parser and request-target behavior. No unrelated change is demonstrated.
Full details: Description check
-
Explanation
The description is detailed and covers the change, problem, fix, verification, and known impacts. It does not use the template headings exactly, but it provides the required information in equivalent sections.
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Actionable comments posted: 1
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @test/js/web/fetch/fetch.test.ts:
- Around line 3129-3131: Update the socket data handler in the test so it
accumulates incoming chunks until the request line’s CRLF is present, then
record the complete line and send the response. Do not close the connection
after only the first data event.
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📒 Files selected for processing: 21
src/runtime/cli/create_command.rssrc/runtime/cli/upgrade_command.rssrc/url/lib.rstest/cli/install/bun-upgrade.test.tstest/cli/install/npmrc.test.tstest/js/bun/cookie/cookie.test.tstest/js/bun/http/async-iterator-stream.test.tstest/js/bun/http/bun-serve-html.test.tstest/js/bun/http/bun-serve-static.test.tstest/js/bun/http/bun-server.test.tstest/js/bun/http/js-sink-sourmap-fixture/index.mjstest/js/bun/util/filesystem_router.test.tstest/js/node/http/max-header-size-fixture.tstest/js/node/http/node-http-maxHeaderSize.test.tstest/js/web/fetch/abortsignal-leak-fixture.tstest/js/web/fetch/fetch-args.test.tstest/js/web/fetch/fetch.brotli.test.tstest/js/web/fetch/fetch.test.tstest/regression/issue/18547.test.tstest/regression/issue/24817.test.tstest/regression/issue/test-21049.test.ts
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Beyond the inline findings, I also checked the "becomes empty after processing" case for the new GITHUB_API_DOMAIN trim in src/runtime/cli/create_command.rs and src/runtime/cli/upgrade_command.rs: the trim runs before the is_empty check, so a value of / falls back to api.github.com rather than producing https:///repos/.... The full-origin form (https://host/) still breaks, but that is pre-existing and not introduced here.
Extended reasoning...
The change removes the leading-// collapse in URL::parse (src/url/lib.rs), affecting every HTTP client, bun install registry, and router consumer of pathname, plus a trailing-slash trim on GITHUB_API_DOMAIN in two CLI commands and a large test rewrite. Inline findings cover the compatibility break, the credentialed-registry and S3 endpoint paths that still differ, and test-coverage gaps, so a human decision on the breaking behavior is needed; this note only records the one extra input case verified as handled.
Findings marked 🟡 are optional suggestions and need no follow-up push.
Additional findings (outside the current diff — GitHub can't attach inline comments there):
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🟣
src/url/lib.rs— Users whose S3 endpoint is typedhttps://host//now sendGET //bucket/keyto the server instead of/bucket/key, and their requests fail with a different error than before. parse_s3_endpoint at src/url/lib.rs:401 strips only one trailing/, leavinghost/as host_with_path, and credentials.rs:385-387 turns that into extra_path/, so normalized_path is//bucket/key(credentials.rs:439). With the loop at src/url/lib.rs:824 gone the wire path is now//bucket/key; S3 and MinIO interpret that as an empty first segment and answer NoSuchBucket/404 instead of the previous SignatureDoesNotMatch. Fix: strip every trailing/in parse_s3_endpoint (use trim_right like the registry join does) sohttps://host//is the same endpoint ashttps://host/.Why this was flagged
An S3Credentials endpoint of
https://host//(from S3_ENDPOINT via src/dotenv/env_loader.rs:280 or the JS options via src/runtime/webcore/s3/credentials_jsc.rs:103) reaches URL::parse_s3_endpoint. The WHATWG pathname is//and strings::without_suffix_comptime at src/url/lib.rs:401 removes exactly one/, so host_with_path becomeshost/. In sign() the first/splits host from extra_path (/) at src/s3_signing/credentials.rs:385-387, and normalized_path is formatted as//bucket/keyat credentials.rs:436-445; this string is both signed (credentials.rs:740) and placed in the URL (credentials.rs:731). On the base branch URL::parse collapsed the wire path to/bucket/keyso the signature mismatched; after this PR the wire path is//bucket/key, which S3-compatible servers treat as an empty bucket segment. Either way the user's endpoint never works, but the failure mode changes; trimming all trailing slashes in parse_s3_endpoint is a one-line fix in this same file that the PR's own registry join already applies (src/install/NetworkTask.rs:579).Verification: On the base branch the same endpoint already fails, so merging does not newly break a working configuration.
parse_s3_endpoint(src/url/lib.rs:398-401) removes exactly one/, sohost_with_pathishost/andnormalized_pathis//bucket/key(src/s3_signing/credentials.rs:436-445). With the loop at src/url/lib.rs:824 removed, the wire request-target is now//bucket/keywhere before it was/bucket/key.
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Findings marked 🟡 are optional suggestions and need no follow-up push.
Still open from earlier reviews (6):
- 🔴
src/url/lib.rs:821—Bun programs that build a request URL as base + "/path" with a base ending in / now reach the server at //path and get… - Also unresolved: 5 minor or pre-existing.
If you have decided not to act on one of these findings, resolve its thread (a reply alone leaves it open) and the next review stops counting it. To review this commit again now, use Re-run on its "Claude Code Review" check.
…, drop every trailing slash of an S3 endpoint A registry with credentials in its URL, http://u:p@host//npm/, is now requested at //npm/pkg like the same registry without credentials. An S3 endpoint is a base: https://host//, https://host/ and https://host all request /bucket/key. parse_s3_endpoint removed one trailing slash and left //bucket/key in the signed path. Tests: the proxy absolute form and the HTTP/2 :path, bun create with a GITHUB_API_DOMAIN that ends in a slash.
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Nothing blocking. The comments below are optional suggestions. There is no need to push a fix for them before merging.
Additional findings (outside the current diff — GitHub can't attach inline comments there):
-
🟣
src/url/lib.rs— nit: S3 users whose endpoint the WHATWG parser rejects still get a//in the request path from trailing slashes, which the base branch already sent as written. The fallback at src/url/lib.rs:390-394 copiesas_written.host_with_path(), which drops only one trailing/(src/url/lib.rs:346-350), while the main path at src/url/lib.rs:401 now usestrim_right. Fix: strip every trailing/on both branches of parse_s3_endpoint, e.g. applystrings::trim_right(.., b"/")to the fallback value too, sohost/prefix//yieldshost/prefixwhichever parser handled it.Why this was flagged
An S3 endpoint such as
https://host:99999/prefix//(a port or host the WHATWG parser refuses butURL::parseaccepts) reachesparse_s3_endpointfrom the S3 client options.whatwg::Parsed::from_utf8returns None at src/url/lib.rs:390, so the fallback at src/url/lib.rs:392 usesas_written.host_with_path(), which removes only the last/(src/url/lib.rs:346-350) and yieldshost:99999/prefix/. The client then buildshttps://host:99999/prefix//bucket/key; on the base branch the loop at the old src/url/lib.rs:824 collapsed leading slashes only, so this path was equally wrong there, but the diff changed the sibling branch at src/url/lib.rs:401 totrim_rightand left this one, so the function's two branches now disagree on how many trailing slashes they remove. The new tests3_endpoint_drops_every_trailing_slashat src/url/lib.rs:1897 only exercises the WHATWG branch.Verification: pre-existing (nit): the fallback branch of
parse_s3_endpointwas left with the old one-slash trim while the main branch gottrim_right, so it yieldshost/prefix/and a request path/prefix//bucket/keyfor an endpoint written with trailing//; the base branch sent the identical path. Trigger: an endpointwhatwg::Parsed::from_utf8rejects (src/url/lib.rs:390-394).
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I re-reviewed the latest push and found no bugs; the earlier inline feedback (bun create coverage, proxy and HTTP/2 request-target rows, href_without_auth keeping leading slashes, reusing startReleaseServer) is addressed in the code now. Because this deliberately changes what fetch, bun install and FileSystemRouter#match report or send for a // path, a maintainer should still decide whether to ship it as a breaking change.
What was reviewed:
- src/url/lib.rs: the removed
//collapse, the new href_without_auth shape (empty,/,//,/npm,//npm/all serialize as the Rust test asserts), and parse_s3_endpoint on both branches. - Every reader of URL.pathname (HTTP/1.1 origin and proxy forms, h2
:path, NetworkTask join, RegistryKey walk, server.fetch base join, cache folder naming, router) — each either keeps the path verbatim by design or trims on its own. - create_command.rs / upgrade_command.rs:
stringsis already imported and trim_right has the(&[u8], &[u8]) -> &[u8]signature; without_suffix_comptime still has other callers. - The thirteen rewritten test files are mechanical
${server.url}/xtonew URL("/x", server.url)changes with no assertion weakened.
Extended reasoning...
The diff deletes the loop in bun_url::URL::parse that collapsed a leading // in pathname, makes href_without_auth and parse_s3_endpoint trim only the right side, and trims a trailing / from GITHUB_API_DOMAIN in bun create and bun upgrade, plus Rust unit tests and JS tests for fetch (direct, proxy, h2), npmrc, s3, FileSystemRouter, bun create and bun upgrade. The security-sensitive surface is the .npmrc token lookup key: it now derives from the uncollapsed path, so a token keyed to //host/npm/ no longer matches a registry written as http://host//npm/, which is npm's behavior and is asserted by a test row. No CODEOWNERS entry covers the changed files and every prior inline comment from this bot was addressed by commits e10b099..f91606b. Deferring rather than approving because the change is an intentional user-visible break (request-targets, install registry paths, router pathname) that the PR description itself labels breaking, which is a product decision for a maintainer.
The S3 endpoint trailing-slash trim moves to its own pull request: it fixes a signature mismatch that exists with or without the collapse.
…h-keep-leading-slashes
Fixes #45330
Breaking change. A request URL built as
base + "/path"with a base that ends in/(the common case is${server.url}/path) now reaches the server as//path.Bun.serveroutes answer 404 to it. Writenew URL("/path", server.url)instead, as the docs already say. An.npmrctoken keyed to//host/npm/no longer applies to a registry typedhttp://host//npm/: the key for it is//host//npm/, as npm builds it. Maintainer call: ship this in a 1.4.x release with a release note, or hold it for 1.5? The same question waits on #44641.Problem
fetch("http://host//a//b?x=1")sendsGET /a//b?x=1 HTTP/1.1. Node (undici), curl and bun's ownnode:httpsendGET //a//b?x=1.new URL(url).pathnameis//a//bin bun too.URL::parse_with(src/url/lib.rs:824) that cut every leading//ofpathnameto one/. The HTTP client sendspathnameas the request-target (src/http/lib.rs:2668). The loop is eb93ae0 (2022, "Trim leading double slashes in URL pathnames"), a repair from the bun install registry work. Its install purpose is now served at the join sites (url: emit a single slash in href_without_auth() for root-path registry URLs #38812, install: consolidate the open package manager pull requests #44968), so no reader ofpathnameinsrc/depends on it.Fix
build_request: the HTTP/1.1 origin form, the proxy absolute form, the HTTP/2 and HTTP/3:path, and each followed redirect. All of them now send the path as written.bun installfollows: a registry typedhttp://host//npm/is requested as//npm/pkg, as npm 11 does, with or without credentials in its URL (href_without_authnow keeps the leading slashes). A root registry typedhttp://host//still requests/pkg. A tarball URL with a//path goes out as written.bun upgradeandbun createtrim a trailing/fromGITHUB_API_DOMAIN. They wrotehttps://host//repos/...with it, and the loop hid that.test/js/web/fetch/fetch.test.ts(origin form and proxy absolute form),fetch-http2-client.test.tsandfetch-http3-client.test.ts(:path),npmrc.test.ts(six registry rows),bun-upgrade.test.ts,bun-create.test.ts,filesystem_router.test.ts. Also ran proxy, s3, bun-install-pathname-trailing-slash and the thirteen rewritten test files on the debug build.Background
bun_url::URLis the byte-slice URL splitter the native HTTP client,bun installandFileSystemRouteruse. Itspathnamefield holds the path plus the query, as written. Itspathfield is query-free and keeps one leading slash. The WHATWG parser (bun_url::whatwg) is separate and was already right.server.urlis aURLwhosehrefends with/, so${server.url}/pathishttp://host//path. Thirteen test files built URLs this way and reached their routes only through the loop. This PR carries the rewrite from test: resolve paths againstserver.urlinstead of joining with a slash #44641 (new URL("/path", server.url)). Merge test: resolve paths againstserver.urlinstead of joining with a slash #44641 first and this PR rebases to 10 files, or merge this PR and test: resolve paths againstserver.urlinstead of joining with a slash #44641 is superseded.hrefinstead ofpathname). It keeps the parser reporting a path that differs from the URL, for every other reader, and adds work per request. The parser is the one place every client path passes through, so the fix lives there.Downsides
${server.url}/pathidiom, see the top. A server that redirects//pathto/pathwith 301 turns a POST into a GET.FileSystemRouter#match(url)still matches the route and reportspathnameasnew URL()does (//posts).http://host//npm/is now requested as//npm/pkg. A server that does not merge slashes answers 404 where it answered 200 before. npm sends the same request.trim_rightcalls run once perbun upgradeorbun createinvocation.Notes
Probes on the debug build.
fetch("http://127.0.0.1:PORT//a//b?x=1")against a rawnetserver:GET //a//b?x=1 HTTP/1.1. Through an HTTP proxy:GET http://example.test//a//b?x=1 HTTP/1.1.http.getof the same URL was alreadyGET //a//b?x=1.Readers of
pathnamechecked.ServerConfigbase URL and the router trim leading slashes themselves.fetch("file://...")uses the separatepathfield, whose trim is unchanged.server.fetch("/x")andserver.fetch("///x")are unchanged, andserver.fetch("//x")already fails on main (//xreads as a host). The cache folder name of a registry typedhttps://host//gains a hash suffix, so its packages download once more.Earlier attempts. The branches
robobun/6cf19512/fetch-keep-leading-slashesandrobobun/91e8acaa/fetch-keep-leading-slashesremoved the same loop and waited on #44641 plus the release question. This PR takes their test rewrite commit as is. Theirhref_without_authand lockfile migration repairs are on main already (#38812, #44968).Test runs. fetch.test.ts: the 19 failures on this container (network,
AbortSignal.timeout(150)under ASAN,"B".repeat(7 * 1024)x100) fail the same way on the unfixed build. bun-server.test.ts, bun-serve-html.test.ts and a few npmrc tests timed out at 5 s in a full-file run and pass alone. The Rust unit tests insrc/url/lib.rsrun undercargo miri testin CI.