Description
Construct synthetic request-header dimensions and exact tuple-key partitions under an explicit trim or exact policy, with wildcard requests isolated.
A protocol fixture is local test data representing headers, messages, identifiers, or request decisions. Serialization and parsing can be checked without contacting a server, while authentication, delivery, and actual client behavior require separate tests.
Construct synthetic request-header dimensions and exact tuple-key partitions under an explicit trim or exact policy, with wildcard requests isolated.
When to use this tool
Use this generator to create reproducible http vary cache key fixture cases from the supplied model or bank. Inspect the returned evidence before using cases in a test or exercise.
How to use the tool and how it works
- Supply dimensions, wildcard, policy, count in the field shapes below. Set seed when you need an explicit replay.
- Run the tool and correct any input error. For generated controls, distinguish a successful fixture containing an invalid case from failure to generate the fixture.
- Read vary, requests, partitions. Use the conventions below and keep answer-bearing fields separate when presenting an exercise.
Serialize and parse Vary, draw values for each case-insensitively distinct header dimension, and build cache keys from the parsed field order using literal or trimmed values. Group equal keys; wildcard mode gives every request a separate synthetic key.1
Delegated operations used for this result: vary parser. Their calculation or parsing conventions apply to the corresponding result fields.2
| Input field | Meaning and units | Accepted input |
|---|---|---|
| dimensions | Dimensions | Required. Array of Object; no unknown keys.; minimum items 1; maximum items 8. |
| dimensions[].name | Name | Required. Text; minimum UTF-16 length 1; maximum UTF-16 length 128. |
| dimensions[].values | Values | Required. Array of Text; maximum UTF-16 length 65536.; minimum items 1; maximum items 16. |
| wildcard | Wildcard | Required. Boolean. |
| policy | Policy | Required. Text; one of "exact", "trim". |
| count | Requested count; the mechanics explain whether one draw expands into several returned records. | Required. Safe integer; minimum 1; maximum 32. |
| seed | Optional numeric seed; takes precedence over context randomness. Without either, use the fixed tool.io default seed. | Optional. Safe integer. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| vary | Vary | Required. Text; maximum UTF-16 length 65536. |
| requests | Requests | Required. Array of Object; no unknown keys.; minimum items 1; maximum items 32. |
| requests[].headers | Headers | Required. Array of Object; no unknown keys.; minimum items 0; maximum items 8. |
| requests[].headers[].name | Name | Required. Text; maximum UTF-16 length 65536. |
| requests[].headers[].value | Value | Required. Text; maximum UTF-16 length 65536. |
| requests[].key | Key | Required. Text; maximum UTF-16 length 65536. |
| partitions | Partitions | Required. Array of Array of Safe integer; minimum 0; maximum 31.; minimum items 1; maximum items 32.; minimum items 0; maximum items 32. |
| randomness | Replay metadata: source is seed or context; seed is the normalized 32-bit seed or null for a context source. | Required. Object; no unknown keys. |
| randomness.seed | Optional numeric replay seed; normalization and precedence are explained below. | Required. Safe integer. or Null. |
| randomness.source | Source | Required. Text; one of "context", "seed". |
An explicit safe-integer seed takes precedence over injected context randomness and is normalized to an unsigned 32-bit integer. With no seed and no context source, replay uses the fixed tool.io default seed. A context source must return finite values from zero inclusive to one exclusive; its advancing state must be retained separately. randomness records the source and normalized seed, or null for context. These generators are not cryptographic random sources.
{
"input": {
"dimensions": [
{
"name": "Accept-Language",
"values": [
"en",
"fr"
]
}
],
"wildcard": false,
"policy": "exact",
"count": 2,
"seed": 42
},
"output": {
"vary": "Accept-Language",
"requests": [
{
"headers": [
{
"name": "accept-language",
"value": "fr"
}
],
"key": "[[\"accept-language\",\"fr\"]]"
},
{
"headers": [
{
"name": "accept-language",
"value": "en"
}
],
"key": "[[\"accept-language\",\"en\"]]"
}
],
"partitions": [
[
0
],
[
1
]
],
"randomness": {
"seed": 42,
"source": "seed"
}
}
}Limitations and assumptions
- Wildcard keys model nonsharing rather than a reusable HTTP cache key. No URL, response freshness, authentication, or complete cache policy is modeled; header value normalization is the explicit caller policy.
- A replay requires the same complete input and implementation. Randomized construction does not guarantee uniform coverage of every feasible output; finite samples can repeat unless a distinct-selection rule is explicitly stated.
- The field tables state structural bounds; cross-field constraints and bounded search or output budgets also apply. Unknown keys are rejected where the object contract disallows them. Input errors are distinct from null fields and deliberate invalid controls in a successful output.
Alternative or Complementary methods
For a supplied example, inspect the returned construction or delegated check directly. To evaluate a consumer, also test cases chosen for its own boundaries; a generated finite corpus does not establish exhaustive coverage.
References
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