FAQ

See also Getting started.

Nothing arrives in the Inbox

I see “inbox has not been created yet”

Create the Inbox in Capture first (or open New Inbox), then use the catch URL from that Inbox.

I cannot open Capture or manage Inboxes

Sign in again and confirm you are in the correct workspace. Ask a workspace admin if you need access.

The live list does not update

Refresh the page. If you opened Spanline from an unexpected host or proxy, try the same address your team normally uses for the app. Confirm your network allows WebSocket connections to the API host.

Requests stop appearing after many hits

Your workspace may enforce a maximum number of stored requests per Inbox. Clear older requests or ask an admin about limits shown in Help.

Body was rejected / truncated

The payload may exceed the size limit for your deployment. Reduce the payload or ask an admin about limits.

Wrong status code came back

Check the Inbox mock status on the Response tab and whether the catch URL ended with a status segment such as /404 (that segment overrides the default).

Authorization headers are visible in the UI

Expected — Capture is a debugger. Use test credentials and delete the Inbox when finished.

Replay failed or hit the wrong host

Absolute replay targets the URL you entered and may be blocked by the browser or network (CORS, mixed content, corporate proxy). Prefer relative replay for same-path tests; never replay production tokens to untrusted URLs.

Compare shows only one request

You need at least two captured requests in the same Inbox. Send another test hit, then open Compare again.

HAR export is empty or missing timing

Export from a request that finished receiving a response. Session export includes all stored requests; very large sessions may take a moment to build.