Sample
Show that path placeholders in Req require an explicit style and are not normalized across syntaxes.
sha256:8d74bb316cf0eb5ddaf0f5e7352fd2d7c0b907fed64b069760446631634aae5b
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
- Show that path placeholders in Req require an explicit style and are not normalized across syntaxes. HOW
- Packages
-
req 0.7.2
- Environment
- elixir
- Created
- 2026-08-17T04:45:26Z
Commonly assumed
Providing `path_params` should replace a URL placeholder like `{id}` even when `path_params_style` is not set.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
Contract
- Curly placeholders in the URL are not interpolated by default, so `{id}` stays unreplaced when `path_params_style` is omitted.
- Using `path_params_style: :curly` with the same `path_params` expands `{id}` into `/items/1` in the request URL.
Files
- NOTES.md
- csx.json
- mix.exs
- mix.lock
- test/contract.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