Results for “http”

Classify one HTTP probe as up, degraded or down, with a reason and message, from status, body and latency.

Seconds to wait from an HTTP Retry-After header (delay-seconds or an HTTP date), or null if missing or malformed.

Count HTTP status codes by class (1xx to 5xx) and give the server error and client error rates in basis points.

Parse one Apache/NCSA Common or Combined Log Format access log line; null for a line in neither format.

The token from an HTTP Authorization header of the form "Bearer <token>" (RFC 6750), or null if it has none.

How long a TLS certificate has left before its notAfter, and whether that is ok, a warning, critical or expired.

A TLS certificate's expiry state as a check status: ok and warning are up, critical is degraded, expired is down.

Interim valuation: gross value to date, retention, previous payments, amount due, VAT or reverse charge, and CIS.

A heartbeat's state as a check status for a status page: up, late as degraded, down as down, new as nothing yet.

Credit note against an original invoice, by units or by amount, with VAT at the original tax point's rates.

Current yield and yield to maturity of a fixed-coupon bond from its clean price, as Excel's YIELD defines it.

Time-weighted return from valuations taken at each external cash flow, geometrically linked exactly.

Construction Industry Scheme deduction (0, 20 or 30%) on the labour part of a subcontractor payment.

Construction Act default dates: payment due, payment notice, final date for payment and pay-less notice.

Whether a UK donation qualifies for Gift Aid: declaration, enough tax paid, and the donor benefit limits.

Check a Companies House company number's format and prefix (SC, NI, OC, LP...) and zero-pad it to eight characters.

Gift Aid a UK charity can claim on a donation: basic rate tax grossed up, 25p per £1 at 20%.

Whether the UK VAT domestic reverse charge applies to a construction supply, and the invoice wording.

Multiwindow, multi-burn-rate SLO alerting: which rules fire, from event counts per window (Google SRE workbook).

Check an HMRC Unique Taxpayer Reference's modulus 11 check digit, accepting the K and spacing people type.

SVG path strings for lines, areas, steps, monotone curves, bars, arcs and pie slices, identical in every language.

Ofgem energy price cap unit rate and daily standing charge for a fuel and payment method on a date (GB average).

Bank of England Bank Rate (base rate) in force on a date, from the Bank's official history since 2001.

Check a date typed into day, month and year boxes, with GOV.UK's error messages and the boxes to mark in error.

Build an 18-digit SSCC pallet label number from extension digit, GS1 company prefix and serial, with its check digit.

Check an EAN-8, UPC-A, EAN-13 or GTIN-14 barcode number against the GS1 mod-10 check digit.

Check a new password against a named policy (NIST SP 800-63B-4 by default): length, common passwords, name and email.

Whether a Faster Payment fits the scheme maximum, the bank's per-payment limit and what is left of its daily limit.

A graduate's student or postgraduate loan repayment for a tax year, as Self Assessment works it out.

kgCO2e from kWh or litres of a fuel, using the UK government GHG conversion factors for the year.

EU distance-selling VAT: which member state's standard rate applies under OSS and the EUR 10,000 threshold, and the VAT.

Check an NHS number's modulus 11 check digit and normalise it to ten digits.

Normalise a phone number to E.164 (+447700900123) using a default country's trunk and dialling prefixes.

Gift Aid claim totals for a period from donation records: donor lines, aggregated small gifts, tax due.

Pupil attendance and absence rates in basis points, with the DfE persistent and severe absence flags.

Vehicle greenhouse gas emissions (grams CO2e) from fuel used or distance, using UK government DESNZ conversion factors.

HMRC approved mileage allowance payments for an employee's own vehicle: tax-free amount, taxable excess or relief.

Latitude/longitude bounding box that contains every point within a distance of a centre point.

Stocking rate: livestock units and LU per hectare from animal numbers, by a published LU coefficient table.

School year group from date of birth on a date, by UK nation: Reception to Year 13, P1 to S6, P1 to Year 14.

Climate Change Levy on a business supply of electricity, gas, LPG or solid fuel, at the main rate in force on the date.

UK statutory late payment interest (8% over Bank Rate) and fixed compensation under the Late Payment Act 1998.

Visitor levy (tourist tax) on an overnight stay: Edinburgh's 5%, Cardiff's per person per night, or a caller's own rule.

Arctangent in radians from + - * / only (fdlibm's method), so every language returns the same double.

Unit price for shelf-edge labels: price per kg, per 100 g, per litre, per 100 ml, per metre or per item.

Check a UK National Insurance number's format and HMRC's disallowed prefix letters, and normalise it.

Field area in square metres, hectares and acres from a boundary polygon of latitude/longitude points.

Growing degree days (thermal time) from daily min/max temperatures, a base and an optional upper cap.

Issue an API's HS256 access token, read one from an Authorization header, and refuse revoked or superseded ones.

Sign, verify and decode HS256 JSON Web Tokens (RFC 7519): signature, algorithm and exp/nbf/iat checked with leeway.

Overdraft interest for a statement period from daily balances, with an interest-free buffer.

Gift Aid Small Donations Scheme top-up for a tax year: the £8,000 limit, the matching rule and community buildings.

A Gift Aid donor's extra tax relief at higher, intermediate, additional and top rates, by extending the tax bands.

UK Payroll Giving for one pay period: the donation comes off pay before PAYE, and the tax it saves the employee.

Axis and label text for charts: tick numbers, SI prefixes (1.2k, 3.4M), percentages, dates and money.

The colour at a point along a sequential or diverging ramp, mixed in OKLab so steps look even; hex in, hex out.

A categorical palette of n colour-blind-safe colours for chart series: Okabe-Ito or Paul Tol's bright scheme.

Bricks and mortar for a wall, openings subtracted, for UK standard 215 x 102.5 x 65 mm bricks with 10 mm joints.

HMAC-SHA256 of a message under a secret key (RFC 2104, RFC 4231), in pure code that also runs in the browser.

PBKDF2 with HMAC-SHA256 (RFC 8018): derive a key from a password and salt, slowly, fast enough for a login request.

The SHA-256 digest of a byte string (FIPS 180-4), in pure code that also runs in the browser.

Age in whole years on a given date, with 29 February birthdays ageing on 1 March in other years.

UK honours degree class (First, 2:1, 2:2, Third) from module marks and credits, weighted by level.

Bytes to base64 and base64url text and back (RFC 4648), with strict decoding, identically in every language.

Bytes to lowercase hexadecimal text and back (RFC 4648 base16), strictly, identically in every language.

Text to UTF-8 bytes and strictly back (RFC 3629), so hashing and signing see the same bytes in every language.

Convert gas meter units (cubic metres or hundreds of cubic feet) to kWh with the calorific value and 1.02264 correction.

Units consumed between two meter reads, counting the meter rolling over past all nines once.

Metered water and sewerage bill from two reads: volumetric charges, return to sewer, standing and surface water charges.

The GOV.UK character count message for a text box: characters or words left or over a limit, with a threshold.

How many cartons fit per layer and per pallet (UK 1200x1000 or EUR 1200x800), within a height and weight limit.

Safety stock in whole units, by service level and demand variability (z-score) or by max-minus-average.

How many identical cartons fit in a 20ft, 40ft or 40ft high-cube container or a 13.6 m trailer, by space and by weight.

Estimated dispatch and delivery dates from order time, dispatch cut-off, service days, weekends and UK bank holidays.

Check the format of a commodity code: 6-digit HS, 8-digit CN or 10-digit TARIC/UK code, with chapter and heading checks.

Step an alert through inactive, pending, firing and resolved, and say which notification to send.

How fast an SLO's error budget is burning: the error rate as a multiple of the rate the SLO allows, in thousandths.

How much of an SLO's error budget is allowed, used and left, from good and bad event counts or seconds.

MTTR, MTBF, downtime and incident counts for a reporting window, from a list of incidents.

Classify an IPv4 or IPv6 address as loopback, private, link-local, multicast, documentation, CGNAT or global.

Check a TCP/UDP port number and name the IANA service registered on it, with its system/user/dynamic range.

A form button in primary, secondary or warning style that stays focusable while loading (GOV.UK button).

Day, month and year boxes under one legend, with hint, error message and the boxes in error marked (GOV.UK date input).

A "There is a problem" box linking to each field in error, focused on arrival, built from a validator's fields (GOV.UK).

Group related inputs under a legend, with a hint and error message described to the whole group (GOV.UK fieldset).

Wire a label, hint and error message to one form control by id, the accessible way (GOV.UK form group pattern).

A password input with a Show/Hide button and an optional live checklist of a password policy (GOV.UK password input).

Choose exactly one of several radios, with item hints, an "or" divider and inline yes/no (GOV.UK radios).

An optional stylesheet for the react.form elements' caps-* classes, themed by --caps-form-* custom properties.

A labelled multi-line text box with hint, error and an optional live character or word count (GOV.UK).

Total a basket: line prices, promotions, a basket discount, VAT per line and delivery, into one checked total.

Customer lifetime value, LTV to CAC ratio and CAC payback months from ARPA, gross margin, churn and CAC.

Price metered usage against tiers, graduated or volume, with an optional flat fee per tier.

An RFC 3339 timestamp with a Z or offset, such as 2026-09-26T13:00:00+01:00, to Unix time in whole seconds.

Write todos as a CSV file (RFC 4180) with one column per field, for backups, spreadsheets and other apps.

Read todos from a CSV file (RFC 4180) as todo.export-csv writes it, checking every row, with row-numbered errors.

Convert length, mass, area, volume, temperature and energy between units, exactly, as decimal text.

Check the format of a SWIFT/BIC code (8 or 11 characters) and split it into its parts.

Check an ISBN-10 or ISBN-13 and convert between them; the normalised form is always the ISBN-13.

Check a 20-character Legal Entity Identifier against its ISO 17442 / ISO 7064 MOD 97-10 check digits.