[No QA] Client drops writes rejected with jsonCode 503 instead of retrying with backoff

[dukenv0307]

Explanation of Change

Throw on jsonCode 503 in processHTTPRequest so the SequentialQueue rolls back and retries with backoff instead of dropping the write and stamping the error on the message

Fixed Issues

$ #100132
PROPOSAL:

Tests

1. Temporarily make the server return jsonCode: 503 for write commands
2. Send a message
3. Verify that the AddComment API will retry instead of showing the red "couldn't be delivered" error

• Verify that no errors appear in the JS console

Offline tests

QA Steps

// TODO: These must be filled out, or the issue title must include "[No QA]."

• Verify that no errors appear in the JS console

PR Author Checklist

• I linked the correct issue in the ### Fixed Issues section above
• I wrote clear testing steps that cover the changes made in this PR
  • I added steps for local testing in the Tests section
  • I added steps for the expected offline behavior in the Offline steps section
  • I added steps for Staging and/or Production testing in the QA steps section
  • I added steps to cover failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
  • I tested this PR with a High Traffic account against the staging or production API to ensure there are no regressions (e.g. long loading states that impact usability).
• I included screenshots or videos for tests on all platforms
• I ran the tests on all platforms & verified they passed on:
  • Android: Native
  • Android: mWeb Chrome
  • iOS: Native
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• I verified there are no console errors (if there's a console error not related to the PR, report it or open an issue for it to be fixed)
• I followed proper code patterns (see Reviewing the code)
  • I verified that any callback methods that were added or modified are named for what the method does and never what callback they handle (i.e. toggleReport and not onIconClick)
  • I verified that comments were added to code that is not self explanatory
  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
• If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
• I followed the guidelines as stated in the Review Guidelines
• I tested other components that can be impacted by my changes (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar are working as expected)
• If any new file was added I verified that:
  • The file has a description of what it does and/or why is needed at the top of the file if the code is not self explanatory
• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
  • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG))
• If new assets were added or existing ones were modified, I verified that:
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• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
• If the PR modifies a component related to any of the existing Storybook stories, I tested and verified all stories for that component are still working as expected.
• If the PR modifies a component or page that can be accessed by a direct deeplink, I verified that the code functions as expected when the deeplink is used - from a logged in and logged out account.
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  • I verified that all the inputs inside a form are aligned with each other.
  • I added Design label and/or tagged @Expensify/design so the design team can review the changes.
• I added unit tests for any new feature or bug fix in this PR to help automatically prevent regressions in this user flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.

Screenshots/Videos

Android: Native

Android: mWeb Chrome

iOS: Native

iOS: mWeb Safari

MacOS: Chrome / Safari

Before:

Screen.Recording.2026-09-11.at.09.41.50.mov

After:

Screen.Recording.2026-09-11.at.09.42.25.mov

[melvin-bot]

@dmkt9 Please copy/paste the Reviewer Checklist from here into a new comment on this PR and complete it. If you have the K2 extension, you can simply click: [this button]

[dukenv0307]

1. Temporarily make the server return jsonCode: 503 for write commands

@dmkt9 I don't think we can do it on the staging server, so you can just review my code change. I already verified it locally 👍

[chatgpt-codex-connector]

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Reviewed commit: 94c9643f78

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[dukenv0307]

@MelvinBot Are the failing unit test & ts check related to this PR?

[MelvinBot]

No — both failures are pre-existing breakage on main, not caused by this PR.

Both trace to the same file, tests/unit/Search/SearchUIUtilsTest.ts, which this PR doesn't touch. Your diff only changes src/CONST/index.ts, src/libs/HttpUtils.ts, and tests/unit/HttpUtilsTest.ts. Nothing you need to do here.

Evidence: the same two failures are hitting other unrelated open PRs right now — for example #100917 and #100908 fail typecheck and test (job 1) with byte-identical errors.

Details on each failure

1. typecheck — TS2741, Property 'rules' is missing in type ... GetSectionsParams

A collision between two PRs that landed on main the same day:

• [Payment due @huult] Enforce new rules structure to determine approval workflows #99894 (merged Sep 10) added rules as a required field on GetSectionsParams at src/libs/SearchUIUtils.ts:669.
• Filter task search rows by live report status instead of the stale snapshot #100069 (merged ~7h later) added two new getSections({...}) call sites that predate that change and don't pass rules — SearchUIUtilsTest.ts:5926 and SearchUIUtilsTest.ts:6061.

Neither PR's own CI caught it because each passed in isolation.

2. test (job 1) — setOptimisticDataForTransactionThreadPreview not called

Failing assertion is SearchUIUtilsTest.ts:12477, in createAndOpenSearchTransactionThread.

I confirmed this is pre-existing but did not isolate the culprit commit. SearchUIUtils.ts and SearchUIUtilsTest.ts are byte-identical between this branch and origin/main (this branch already merged main), so the PR can't be the cause. createAndOpenSearchTransactionThread calls the mocked function unconditionally at SearchUIUtils.ts:2961 with no guard, so the mechanism is likely mock/module-resolution or test-order related rather than a logic change.

Also failing, but ignorable: Check independent approval and checklist are process checks, not code checks.

These need a fix on main — merging latest main into this branch won't clear them.

[dmkt9]

1. Temporarily make the server return jsonCode: 503 for write commands

@dmkt9 I don't think we can do it on the staging server, so you can just review my code change. I already verified it locally 👍

@dukenv0307 Ty. I'll take a look.

[dmkt9]

@dukenv0307 Should we log the failure?

App/src/libs/Middleware/Logging.ts

Lines 149 to 153 in 85cbfbe

	} else if (error.message === CONST.ERROR.EXPENSIFY_SERVICE_INTERRUPTED) {
	// Expensify site is down completely OR
	// Auth (database connection) is down / bedrock has timed out while making a request. We currently can't tell the difference between Auth down and bedrock timing out.
	Log.hmmm('[Network] API request error: Expensify service interrupted or timed out', logParams);
	} else if (error.message === CONST.ERROR.THROTTLED) {

[dmkt9]

@codex review

[chatgpt-codex-connector]

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[dmkt9]

Reviewer Checklist

• I have verified the author checklist is complete (all boxes are checked off).
• I verified the correct issue is linked in the ### Fixed Issues section above
• I verified testing steps are clear and they cover the changes made in this PR
  • I verified the steps for local testing are in the Tests section
  • I verified the steps for Staging and/or Production testing are in the QA steps section
  • I verified the steps cover any possible failure scenarios (i.e. verify an input displays the correct error message if the entered data is not correct)
  • I turned off my network connection and tested it while offline to ensure it matches the expected behavior (i.e. verify the default avatar icon is displayed if app is offline)
• I checked that screenshots or videos are included for tests on all platforms
• I included screenshots or videos for tests on all platforms
• I verified that the composer does not automatically focus or open the keyboard on mobile unless explicitly intended. This includes checking that returning the app from the background does not unexpectedly open the keyboard.
• I verified tests pass on all platforms & I tested again on:
  • Android: HybridApp
  • Android: mWeb Chrome
  • iOS: HybridApp
  • iOS: mWeb Safari
  • MacOS: Chrome / Safari
• If there are any errors in the console that are unrelated to this PR, I either fixed them (preferred) or linked to where I reported them in Slack
• I verified proper code patterns were followed (see Reviewing the code)
  • I verified that comments were added to code that is not self explanatory
  • I verified that any new or modified comments were clear, correct English, and explained "why" the code was doing something instead of only explaining "what" the code was doing.
  • I verified any copy / text that was added to the app is grammatically correct in English. It adheres to proper capitalization guidelines (note: only the first word of header/labels should be capitalized), and is either coming verbatim from figma or has been approved by marketing (in order to get marketing approval, ask the Bug Zero team member to add the Waiting for copy label to the issue)
• If a new code pattern is added I verified it was agreed to be used by multiple Expensify engineers
• I verified that this PR follows the guidelines as stated in the Review Guidelines
• I verified other components that can be impacted by these changes have been tested, and I retested again (i.e. if the PR modifies a shared library or component like Avatar, I verified the components using Avatar have been tested & I retested again)
• If a new component is created I verified that:
  • A similar component doesn't exist in the codebase
  • All props are defined accurately
  • The component has a clear name that is non-ambiguous and the purpose of the component can be inferred from the name alone
  • The only data being stored in the state is data necessary for rendering and nothing else
  • The component has the minimum amount of code necessary for its purpose, and it is broken down into smaller components in order to separate concerns and functions
• If a new CSS style is added I verified that:
  • A similar style doesn't already exist
  • The style can't be created with an existing StyleUtils function (i.e. StyleUtils.getBackgroundAndBorderStyle(theme.componentBG)
• If the PR modifies code that runs when editing or sending messages, I tested and verified there is no unexpected behavior for all supported markdown - URLs, single line code, code blocks, quotes, headings, bold, strikethrough, and italic.
• If the PR modifies a generic component, I tested and verified that those changes do not break usages of that component in the rest of the App (i.e. if a shared library or component like Avatar is modified, I verified that Avatar is working as expected in all cases)
• If the PR modifies a component related to any of the existing Storybook stories, I tested and verified all stories for that component are still working as expected.
• If the PR modifies a component or page that can be accessed by a direct deeplink, I verified that the code functions as expected when the deeplink is used - from a logged in and logged out account.
• If the PR modifies the UI (e.g. new buttons, new UI components, changing the padding/spacing/sizing, moving components, etc) or modifies the form input styles:
  • I verified that all the inputs inside a form are aligned with each other.
  • I added Design label and/or tagged @Expensify/design so the design team can review the changes.
• For any bug fix or new feature in this PR, I verified that sufficient unit tests are included to prevent regressions in this flow.
• If the main branch was merged into this PR after a review, I tested again and verified the outcome was still expected according to the Test steps.
• I have checked off every checkbox in the PR reviewer checklist, including those that don't apply to this PR.

Screenshots/Videos

Android: HybridApp

Android: mWeb Chrome

iOS: HybridApp

iOS: mWeb Safari

MacOS: Chrome / Safari

chrome.mp4

[dmkt9]

The changes look good to me

[mountiny]

Thanks! @dukenv0307 can you check the failing CI please?