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.

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

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

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

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

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

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

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

Issue an API's HS256 access token, read one from an Authorization header, and refuse revoked or superseded ones.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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.

Check a 17-character vehicle identification number and its check digit; enforced for North American VINs.

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

Allow a login attempt or lock the account out, from its recent failed attempts, with the seconds until it may retry.

Apply a monthly fee cap to a list of account charges: charge up to the cap, waive the rest.

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.

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

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

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

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.

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

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

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.

Estimated annual solar PV generation by the MCS method: kWp x Kk x shade factor, per array and in total.

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

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.

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

How many decimal places a currency's minor unit has, from the ISO 4217 list.

A question answered by ticking any of several checkboxes, with item hints and an exclusive "None" (GOV.UK checkboxes).

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

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

A labelled drop-down list with a hint, error message and an optional empty first option (GOV.UK select).

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.

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.

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

AER (annual equivalent rate) from a gross nominal rate and how often interest is paid, to two decimal places.

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

WCAG 2.x contrast ratio between two colours, and which text colour reads best on a background.

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

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

Electricity or gas bill from two meter reads: energy, standing charge, Climate Change Levy and VAT.

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

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

A form's state as a pure reducer: values, touched fields, validator errors and the submit, for useReducer.

A discretionary service charge on a bill's eligible lines, as a basis-point rate with explicit rounding.

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

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

One checkbox with its label beside it, such as "I agree to the terms" (GOV.UK single checkbox).

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

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

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

Parse Vocalink's VALACDOS.txt and SCSUBTAB.txt into the table UK sort code modulus checking needs.

Check a UK sort code and account number with the Vocalink/Pay.UK modulus rules, against a table you supply.

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

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

Seed rate in kg/ha from target plants per m², thousand-grain weight and expected establishment.

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

Hash a password for storage as pbkdf2_sha256$iterations$salt$hash, verify one in constant time, and spot weak hashes.

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

Bacs three-day cycle: input, processing and entry (arrival) dates for a submission, skipping weekends and bank holidays.

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

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.