# lobuhi/byp4xx

40X/HTTP bypasser in Go. Features: Verb tampering, headers, #bugbountytips, User-Agents, extensions, default credentials...

Repository: https://github.com/lobuhi/byp4xx
Canonical: https://ross.abutalabs.com/products/byp4xx
Language: Go
License Family: other
Last push: 2023-07-03T14:40:54+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 2112, "days_push": 1157, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, no_license
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1888, forks 306 (observed 2026-08-28T04:05:49.350415+00:00)

## What it is
byp4xx is a command-line tool written in Go that attempts to bypass HTTP 40X (access denied) responses using techniques like verb tampering, custom headers, User-Agents, path variations, extensions, and default credentials. It wraps cURL options and applies wordlists from SecLists, including methods popularized by #bugbountytips.

## Use cases
- bypass 403 forbidden responses on a URL
- test verb tampering to access restricted endpoints
- try default credentials on 401 protected resources
- probe endpoints with custom headers like X-Custom-IP-Authorization
- rate-limit-aware bypass testing during bug bounty hunting
- test multiple user agents and path extensions against a protected path

## When to choose
- you need a quick automated way to test 40X bypass techniques during a pentest or bug bounty
- you want a single Go binary that reuses familiar cURL flags
- you need configurable rate limiting or threading for bypass attempts

## When to avoid
- you need a full web vulnerability scanner rather than a focused 40X bypasser
- you require a maintained project with a license and active releases
- you need GUI-based testing or detailed reporting of findings

## Facets
- artifact type: cli-tool
- maturity: maintenance
- function: security, http-client, penetration-testing
- domain: security, penetration-testing, web-development
- platform: windows, cli, cross-platform
- tags: http-40x-bypass, bug-bounty, curl-wrapper, verb-tampering, rate-limiting, go, command-line, linux, macos

## Member repositories
- lobuhi/byp4xx (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:05:49.350415+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T03:13:30.348055+00:00, confidence not recorded.
  - readme: https://github.com/lobuhi/byp4xx (fetched 2026-08-28T04:05:49.350415+00:00, sha 8b108c639bce)
- Data as of 2026-08-30T08:39:29.467469+00:00.