Deadfinder::Runner

Sentinel stored in the status cache when a URL could not be fetched (connection refused, timeout, TLS failure, …). Real HTTP status codes are always >= 0, so -1 unambiguously marks a connection error.

First backoff step for --retry. Doubles per attempt (200ms, 400ms, 800ms, …) and is jittered, so a burst of workers that all trip the same rate limiter does not come back in lockstep and trip it again.

Fraction of the computed backoff that jitter may add or remove.

srcset holds a list of candidates with optional descriptors (img-480.png 480w, img-2x.png 2x), so it is expanded by parse_srcset rather than read verbatim like the single-URL attributes above.

Fragments that address the top of the document rather than an element. # (empty) and #top are valid by definition (HTML spec, "scroll to the fragment"), so --check-anchors must never report them as broken.

Sized lazily from the run's -c. Runner is instantiated in several places (and per target on some paths), so the budget cannot live on an instance — every target has to draw from the same pool for the cap to mean anything.

Drops any in-flight bookkeeping left over from a previous run. Only relevant to back-to-back runs in one process (tests, embedded usage).