2019-10-02 01:04:56 +00:00
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# HTTP API
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2021-10-06 00:46:09 +00:00
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[OpenAPI Specification](https://ethereum.github.io/beacon-APIs/)
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2020-09-29 03:46:54 +00:00
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## Beacon Node
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2019-12-19 00:45:28 +00:00
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A Lighthouse beacon node can be configured to expose a HTTP server by supplying the `--http` flag. The default listen address is `localhost:5052`.
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2019-10-02 01:04:56 +00:00
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The following CLI flags control the HTTP server:
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2019-12-19 00:45:28 +00:00
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- `--http`: enable the HTTP server (required even if the following flags are
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provided).
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- `--http-port`: specify the listen port of the server.
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- `--http-address`: specify the listen address of the server.
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2019-10-02 01:04:56 +00:00
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2022-03-02 01:05:08 +00:00
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The schema of the API aligns with the standard Ethereum Beacon Node API as defined
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at [github.com/ethereum/beacon-APIs](https://github.com/ethereum/beacon-APIs).
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2020-09-29 03:46:54 +00:00
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It is an easy-to-use RESTful HTTP/JSON API. An interactive specification is
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available [here](https://ethereum.github.io/beacon-APIs/).
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2019-10-02 01:04:56 +00:00
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2019-12-19 00:45:28 +00:00
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## Troubleshooting
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2019-12-19 00:45:28 +00:00
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### HTTP API is unavailable or refusing connections
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2019-10-02 01:04:56 +00:00
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2019-12-19 00:45:28 +00:00
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Ensure the `--http` flag has been supplied at the CLI.
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2019-12-19 00:45:28 +00:00
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You can quickly check that the HTTP endpoint is up using `curl`:
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2019-10-02 01:04:56 +00:00
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```
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curl "localhost:5052/beacon/head"
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2019-10-02 01:04:56 +00:00
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2019-12-19 00:45:28 +00:00
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{"slot":37934,"block_root":"0x4d3ae7ebe8c6ef042db05958ec76e8f7be9d412a67a0defa6420a677249afdc7","state_root":"0x1c86b13ffc70a41e410eccce20d33f1fe59d148585ea27c2afb4060f75fe6be2","finalized_slot":37856,"finalized_block_root":"0xbdae152b62acef1e5c332697567d2b89e358628790b8273729096da670b23e86","justified_slot":37888,"justified_block_root":"0x01c2f516a407d8fdda23cad4ed4381e4ab8913d638f935a2fe9bd00d6ced5ec4","previous_justified_slot":37856,"previous_justified_block_root":"0xbdae152b62acef1e5c332697567d2b89e358628790b8273729096da670b23e86"}
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2019-10-02 01:04:56 +00:00
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```
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