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HTTP::API::Core is a reusable policy layer for Perl JSON API clients, not a replacement for an HTTP library. You still choose a transport such as HTTP::Tiny, LWP, Mojo::UserAgent, or Furl—and still write methods for the service you are calling. The package is intended to centralize the recurring work between those methods and the transport: JSON handling, query encoding, errors, retries, pagination, rate limits, and request metadata.
Where HTTP::API::Core fits
A small API wrapper often grows beyond sending requests. It may need to encode query parameters consistently, decode JSON, turn failures into predictable errors, respect rate limits, paginate through results, and expose request IDs or timing. HTTP::API::Core is designed to gather those cross-cutting policies in a shared layer above the HTTP transport, as described in its package documentation.
That boundary matters: the core does not know the service-specific meaning of a resource or endpoint. You still write the methods that make the client useful, such as a get_user method that calls the appropriate service endpoint and maps its response for your application. The package is not an HTTP stack, service-specific SDK, OpenAPI generator, GraphQL client, WebSocket implementation, or async runtime.
What the shared layer is documented to handle
The project README lists several recurring API-client concerns as package capabilities. Which ones matter depends on the service and your client; the list is not a claim that every API requires every feature.
#1 Best Overall
- Request and response handling: JSON bodies and responses, query-parameter encoding, and form-urlencoded bodies.
- Failure and retry policy: structured errors, safe retries, and handling for
Retry-After. - API behavior: rate limits and pagination by next URL, page number, or cursor.
- Client integration: authentication hooks, request IDs, timing, and other hooks.
- Idempotency: support for caller-supplied idempotency keys without imposing a service-specific header name.
These are documented features, not independently measured performance, reliability, or productivity results. The project describes its aims as a small, predictable, dependency-light, testable foundation for production-oriented clients, with attention to timeouts, transient failures, backoff, jitter, and tracing. Those are design goals rather than a guarantee that an integration will meet a particular service’s requirements. See the distribution documentation.
How the transport boundary works
The constructor’s documented transport option accepts either a code reference or an object with a request method. The core prepares the request and passes the transport the normalized uppercase method, final URL, and request options. The URL can already include base-URL joining, query construction, and changes made by a before_request hook.
Rank #2
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For a request body, the content option is omitted when no body was supplied. If a body was explicitly supplied, the option is present—even when the body is an empty string. That distinction can matter to transports and APIs that treat an absent body differently from an explicitly empty one. The exact adapter contract is described in the transport documentation.
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A transport returns a hash with a required three-digit status from 100 through 599; reason, headers, and raw content are optional. The core converts that result into its response object. Ordinary transport exceptions and malformed results are normalized as structured transport errors, and ordinary exceptions can take part in the configured retry policy. Keep API-level JSON decoding, pagination, rate-limit policy, and authentication above this boundary unless the chosen HTTP library requires a transport-specific implementation.
Choosing and connecting a transport
The project names HTTP::Tiny, LWP, Mojo::UserAgent, Furl, and a test transport as possible choices. The sources do not provide comparative benchmarks, so there is no documented basis to rank these libraries by speed or reliability. Choose according to the dependencies already in your application, runtime constraints, and how readily you can implement the adapter contract.
In practice, the adapter is the seam to inspect first: confirm that your transport can receive the prepared method, URL, and options, then return the required status and any available response fields. For testing, a controllable test transport can exercise request construction and response handling without making real network calls—an approach consistent with the project’s stated emphasis on deterministic tests.
Rank #4
Retries and idempotency require an explicit safety decision
The project direction says unsafe methods should not be retried by default. That is an important constraint for operations such as creating or changing a resource: retrying after a connection failure may repeat an operation whose first result the client never received.
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Best Value
When to use a shared API layer—and when not to
There are two reasonable approaches: use an HTTP transport directly and implement API policy in each client, or put a reusable API-client layer above the transport. The direct approach can be enough for a small client with few endpoints and little shared behavior. A common layer becomes more useful when multiple clients repeat the same handling for JSON, errors, pagination, rate limits, retries, and observability.
Another Perl distribution, HTTP::API::Client, is described by MetaCPAN as a thin LWP::UserAgent wrapper with callbacks, retry-with-backoff, and JSON/form encoding. It makes a different transport choice. Compare the packages against your existing dependencies, transport flexibility needs, policy coverage, and the service-specific code you expect to maintain; the available documentation does not establish a universally superior option.
Installation and version considerations
The README’s installation example is cpanm HTTP::API::Core. The documentation reviewed includes HTTP::API::Core 1.01 and 1.08, so do not assume an example or behavior from one release applies unchanged to another. Check the live distribution documentation for the version you plan to install before relying on a constructor option or adapter detail.
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