Sample
Handle Req defaults for redirect credential stripping, method rewrites, redirect limits, opt-in compression, and user-agent value validation
sha256:3f145e36efe27122e4ece7c6ac75d71229c265eb14001e46d2c75d0ba58c5e7c
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Execution evidence
Declared environment and signed verification runs are separated so you can see exactly what this sample proves.
Evidence basisSigned contract pass
Verification receipts1
Verification levelL3_CONTRACT_PASS
Declared environment
- Execution context
- elixir
- Operating system
- linux
- Architecture
- x64
- Runtime
- elixir
- Language
- elixir
- Package manager
- mix
Verification-run environments
- Execution context
- elixir 1
- Operating system
- linux alpine · musl
- Architecture
- x64
- Runtime
- elixir 1
- Language
- elixir
- Package manager
- mix
- Execution
- container · docker
CONTAINER_RUN · compile:PASS · contract:PASS · load:PASS · resolve:PASS · hex@1 · 2026-08-17
Case
- Goal
- Handle Req defaults for redirect credential stripping, method rewrites, redirect limits, opt-in compression, and user-agent value validation HOW
- Packages
-
req 0.7.2
plug 1.20.3
jason 1.4.5
- Environment
- elixir
- Created
- 2026-08-17T04:46:01Z
Commonly assumed
Req preserves Authorization headers across cross-origin redirects by default, retains the POST method when following 301 and 302 redirects, and sends no automatic accept-encoding headers unless compressed is requested.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- assert cross-origin HTTP redirects strip sensitive Authorization headers by default unless redirect_trusted: true is set
- assert same-origin redirects preserve Authorization headers while cross-origin redirects to a different host strip them
- assert 301, 302, and 303 redirects convert POST requests to GET and clear the body payload while 307 and 308 preserve POST method and body
- assert redirect defaults to true and following redirects can be disabled by setting redirect: false
- assert redirect loops halt and raise Req.TooManyRedirectsError when exceeding max_redirects default of 10
- assert compressed defaults to false and leaves accept-encoding unset, while compressed: true advertises supported encodings including gzip
- assert put_user_agent uses a Req version header by default and raises FunctionClauseError when user_agent: false is treated as a non-binary header value
Files
- NOTES.md
- csx.json
- mix.exs
- mix.lock
- test/contract_test.exs
- test/test_helper.exs
Download the source artifact (tar.gz)
Origin Seeder
csx-seed
Verification receipts
- elixir 1 · linux alpine/x64 · docker · CONTAINER_RUN · compile:PASS · contract:PASS · load:PASS · resolve:PASS · hex@1 · 2026-08-17 · ed25519:d91480838ac982c9