Keep a held form's page as it was filled in by yohamta0 · Pull Request #3430 · dagucloud/dagu

yohamta0 · 2026-10-30T05:30:17Z

Summary

When the write gate blocked a form that loads a page, it answered the load with Fetch.fulfillRequest serving a "Not sent" page. That page replaced the document the form was filled in on, in the main frame and in frames alike:

A screenshot taken right after the hold, meant to show a person the form waiting for approval, showed only "Not sent".
The same operation run again with --allow-write <signature> ran on the "Not sent" page, where the form no longer existed, so the approved write could not be sent (element 0-5 is not on the page now).
On sites that move between pages by posting forms inside framesets, the frame just showed "Not sent".

Fix

internal/browserhost/writegate/gate.go: a blocked page load that a page started, by a form or a link, now fails with Fetch.failRequest and errorReason: Aborted. The browser cancels the navigation without committing an error page, so the frame keeps its document with the values filled in. The write is kept in the ledger and reported exactly as before.

A GET the browser loads on its own, such as a goto to an address the policy declares a write, still gets the "Not sent" page. The page-started check is: not a GET, carries a Referer, or was sent under the no-referrer policy (a rel=noreferrer link, or a page served with that policy). Fetch.requestPaused carries no Sec-Fetch-* headers at the Request stage, so they cannot be used. A page-started GET whose Referer the default policy drops, such as HTTPS to HTTP, still gets the "Not sent" page, as before this PR. The browser runtime's page.goto ignores Page.navigate's errorText and waits for a Page.frameNavigated that an aborted load never sends, so aborting a goto would hang it until the operation timeout (2 minutes by default). A goto also has no page of its own to keep.

internal/runtime/builtin/browser/session.go: before this change, the "Not sent" page told a rehearsing session's caller that the click was held. The form now stays on its page, so the result says it in words, as a warning: the write gate blocked POST https://…/entries, so nothing was saved; a rehearsal does not send it. A caller no longer has to tell that apart from a click that did nothing. Record mode already reports write_blocked with the --allow-write hint, unchanged. The do command's help now says the same operation, allowed its write, sends a held form.

CDP behavior, checked in Chrome 156 (headless)

Each case below ran against a local server, intercepting on the browser target as the gate does. The frame tree and the target frame's location, title, and typed input value were compared before and after.

Held load	`Aborted`	`AccessDenied` / `BlockedByClient`	`fulfillRequest` (before)
form POST, main frame	same document (same loader ID), typed value kept	`chrome-error://chromewebdata/`	"Not sent" document
form POST from one frameset frame into another	target frame keeps its document	target frame shows the error page	"Not sent" in the frame
form POST inside its own frameset frame	same	error page	"Not sent"
form POST inside an iframe	same	error page	"Not sent"
form POST inside a cross-site iframe (separate process)	iframe target keeps its URL	—	—

With Aborted, the browser reports Network.loadingFailed with net::ERR_ABORTED, canceled: true, no blockedReason, and no Page.frameNavigated. It is not counted among the requests allowed_domains blocked, which counts blockedReason: inspector.
A GET form submission into a frame is not a write and loads as before.

Tests

internal/browserhost/writegate/gate_test.go (real Chrome):
- TestGateHoldsAFormOnItsPage: page, frameset, and iframe cases. After the hold, the frame keeps its address and the value typed into the form, nothing reaches the site, and the ledger has the blocked Document write.
- TestGateLoadsAFormThatReads: a GET form in a frameset loads its page and is not an event.
- TestGateHoldsALoadByWhoStartedIt: a link to an address the policy declares a write keeps the page, with or without rel=noreferrer. A Page.navigate to the same address ends on "Not sent".
- TestGateBlocksWritesItRehearses now waits for the form's load to end, through Page.frameStoppedLoading, instead of waiting for the "Not sent" title.
conformance/spec079_browser_session/write_gate_test.go: TestSessionRecordSendsAHeldForm opens a record session, types 2500 into the form, and clicks Submit. The click is held with write_blocked and the page stays. The same click with --allow-write then sends amount=2500. With the binary built from main, this test fails with element 0-5 is not on the page now.
internal/runtime/builtin/browser/session_write_gate_test.go: the rehearsal warning.

Passed locally:

go test ./internal/browserhost/... ./internal/runtime/builtin/browser/... ./internal/cmd/
the spec072_browser and spec079_browser_session conformance tests
golangci-lint on the touched packages (also with GOOS=windows)
the writegate tests, run three times with -race

Summary by CodeRabbit

Improvements
- When a write is blocked during a rehearsal, the page keeps the form filled in and stays on the current page. The result warns that nothing was saved and rehearsals do not send writes.
- You can approve a blocked form submission using its reported signature. Approval sends the values the form holds at that time, if it still accepts the same operation.
- Blocked browser-started navigations show a “Not sent” page in applicable cases; page-initiated navigation remains on the original page.

Related Issues

None closed. #3433 tracks a related engine issue found along the way: goto to a download or a 204 waits for the whole operation timeout.

Checklist

Code follows the project style guidelines
Self-review of the code has been performed
Tests have been added or updated as needed
Documentation has been updated as needed (the browser session do help)
Changes have been tested locally

The write gate answered a blocked page load with a "Not sent" page, which replaced the document the form was filled in on, in the main frame and in frames alike. A screenshot meant to show the person what waits for approval showed only that page, and the operation run again with --allow-write found no form to submit, so the approved write could not be sent. A blocked load a page started, by a form or a link, now fails with Aborted. The browser cancels it without committing an error page, so the frame keeps its document; Chrome does this for a form posted in the main frame, into a frameset frame, and inside an iframe. A GET the browser loads on its own, as a goto does, still gets the "Not sent" page: nothing on a page asked for it, and the browser runtime's goto waits for a page that a cancelled load never brings.

A rehearsing session reported a blocked write only in its writes list. The "Not sent" page said so too, but a blocked form now stays on its page as it was filled in, so a caller reading the page could take the operation for one that did nothing and submit again. The result now carries a warning naming the write, and the do command's help says the same operation, allowed its write, sends a held form.

coderabbitai · 2026-10-30T05:30:48Z

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Walkthrough

The write gate now keeps page-initiated blocked document requests in the current page, while direct browser loads can receive the “Not sent” page. Tests cover forms in pages and frames, read-only GET forms, and navigation sources. Session results warn when a rehearsal blocks a write, and a record-mode test checks approval by signature.

Changes: Browser write gate

Layer / File(s)	Summary
Blocked document request handling `internal/browserhost/writegate/gate.go`	The gate checks method, referrer, and referrer policy for blocked document requests. It aborts requests that are not direct GET loads without a `no-referrer` policy. Other blocked document requests receive the “Not sent” page.
Browser gate lifecycle and coverage `internal/browserhost/writegate/gate_test.go`	Test helpers track DevTools events and wait for frame loading. Tests cover held forms in pages and frames, read-only GET forms, and page-initiated versus direct navigation.
Session write reporting and approval `internal/runtime/builtin/browser/session.go`, `internal/runtime/builtin/browser/session_write_gate_test.go`, `internal/cmd/browser_session.go`, `conformance/spec079_browser_session/write_gate_test.go`	Session results warn when a rehearsal blocks a write. The command documentation describes retrying with the form still filled in. The conformance test checks that a blocked submission reports its URL and can be approved by signature.

Priority: Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Possibly related issues

Browser goto to a download or a 204 waits for the whole timeout #3433: The gate aborts some page-initiated loads. The issue also concerns cancelled browser navigations, but this change does not address all reported timeout cases.

Possibly related PRs

dagucloud/dagu#3336: Adds the write gate and its blocked-document behavior, which this PR changes.
dagucloud/dagu#3337: Adds record mode and signature-based write approval, which the conformance test exercises.
dagucloud/dagu#3346: Changes write-gate event ordering in the same browser outcome flow.

Merge Risk: Minimal · up to de74f

The PR improves blocked page-started loads without worsening the existing ambiguous referrerless GET behavior, so no merge-blocking risk is identified.

Pre-merge checks: 5

Check name	Status	Explanation
Title check		The title "Keep a held form's page as it was filled in" matches the main change: blocked page-started form loads now abort with Fetch.failRequest/Aborted so the form's document and typed values stay o…
Docstring Coverage		Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.
Description check		The description follows the repository template. It has Summary, Changes, Related Issues, and Checklist sections. It explains the bug, the fix, the CDP behavior checked in Chrome, and the tests run. T…

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Explanation

The title "Keep a held form's page as it was filled in" matches the main change: blocked page-started form loads now abort with Fetch.failRequest/Aborted so the form's document and typed values stay on the page instead of being replaced by the "Not sent" page. It is specific, concise, and a teammate scanning history would understand the primary change.

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Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 3 functions across 6 files.

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The description follows the repository template. It has Summary, Changes, Related Issues, and Checklist sections. It explains the bug, the fix, the CDP behavior checked in Chrome, and the tests run. The Changes section is written as prose sections instead of one-item-per-line bullets, which is a minor format deviation. The Checklist items are all checked and the documentation update is noted. The description is detailed and specific, and it covers the required information. The description is mostly complete, so the check passes.

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Actionable comments posted: 3

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Inline comments:
Review comments at @internal/browserhost/writegate/gate_test.go:
- Around line 497-499: Update the test case around `p.submit` to fill and assert
the input in `tc.form`, so the frameset case exercises the menu form’s `page`
input rather than the body frame’s `title` input. Retain the existing checks on
the destination frame.

Review comments at @internal/browserhost/writegate/gate.go:
- Line 532: Update the request-gating branch that checks req.Method and referred
so a missing Referer does not classify a page-initiated GET as a direct load;
use Sec-Fetch-Site or another available navigation-origin signal while
preserving the direct-load fallback. Add a regression test for a page-initiated
GET without a Referer.

Review comments at @internal/cmd/browser_session.go:
- Around line 437-438: Qualify the browser-session retry guidance so it does not
imply that repeating the operation always sends the blocked write; state that
allowing the write works only if the form still accepts the same operation.

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conformance/spec079_browser_session/write_gate_test.go
internal/browserhost/writegate/gate.go
internal/browserhost/writegate/gate_test.go
internal/cmd/browser_session.go
internal/runtime/builtin/browser/session.go
internal/runtime/builtin/browser/session_write_gate_test.go

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A load a page started without naming itself as the Referer, through a noreferrer link or from a page under the no-referrer policy, was taken for the browser's own load and answered with the "Not sent" page, so the page was replaced. Its referrer policy marks it as the page's: the paused request carries no Sec-Fetch-* headers to tell by. The frameset case of the held-form test now also fills in the form it posts, so a held form that lost its values fails it.

Running the same operation with its write allowed sends a held form only while the form still accepts that operation; a page's script may have changed the form when the write was held, such as by disabling its button.

yohamta0 · 2026-10-30T05:45:25Z

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yohamta0 · 2026-10-30T06:31:14Z

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Review comments at @internal/cmd/browser_session.go:
- Around line 437-438: Update the blocked form-write warning in the browser
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A page's script may change or reset a form after its write was held, and running the operation again sends what the form holds then, not what the blocked write carried. The do help now says so and asks for the values to be checked before the write is allowed.

yohamta0 · 2026-10-30T06:45:06Z

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yohamta0 added 2 commits October 30, 2026 14:25

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Comment thread internal/browserhost/writegate/gate_test.go Resolved

Comment thread internal/browserhost/writegate/gate.go Resolved

Comment thread internal/cmd/browser_session.go Resolved

yohamta0 added 2 commits October 30, 2026 14:41

Qualify how a held form is sent again

00c4f10

Running the same operation with its write allowed sends a held form only while the form still accepts that operation; a page's script may have changed the form when the write was held, such as by disabling its button.

yohamta0 mentioned this pull request Oct 30, 2026

Browser goto to a download or a 204 waits for the whole timeout #3433

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Comment thread internal/cmd/browser_session.go Resolved

yohamta0 merged commit 561d6d2 into main Oct 30, 2026
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yohamta0 deleted the fix/held-form-keeps-page branch October 30, 2026 07:11

yohamta0 mentioned this pull request Oct 30, 2026

End a goto when its load brings no page #3436

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coderabbitai Bot mentioned this pull request Oct 30, 2026

Give each foreach item a browser record of its own #3443

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Keep a held form's page as it was filled in - #3430

Keep a held form's page as it was filled in#3430
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Summary

Fix

CDP behavior, checked in Chrome 156 (headless)

Tests

Summary by CodeRabbit

Related Issues

Checklist

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