Added API docs and bug fixes.

doc/API.md

@@ -0,0 +1,53 @@
+# HTTP API
+
+If you want use API you need choice a port where is internal HTTP server will listen for incoming connections. API will not available if miner built without `libmicrohttpd`.
+
+Example configuration:
+
+```json
+"api": {
+    "port": 44444,
+    "access-token": "TOKEN",
+    "worker-id": null,
+    "ipv6": false,
+    "restricted": false
+},
+```
+
+* **port** Port for incoming connections `http://<miner ip>:<port>`.
+* **access-token** [Bearer](https://gist.github.com/xmrig/c75fdd1f8e0f3bac05500be2ab718f8e#file-api-html-L54) access token to secure access to API.
+* **worker-id** Optional worker name, if not set will be detected automatically.
+* **ipv6** Enable (`true`) or disable (`false`) IPv6 for API.
+* **restricted** Use `false` to allow remote configuration.
+
+If you prefer use command line options instead of config file, you can use options: `--api-port`, `--api-access-token`, `--api-worker-id`, `--api-ipv6` and `api-no-restricted`.
+
+## Endpoints
+
+### GET /1/summary
+
+Get miner summary information. [Example](api/1/summary.json).
+
+### GET /1/threads
+
+Get detailed information about miner threads. [Example](api/1/threads.json).
+
+
+## Restricted endpoints
+
+All API endpoints below allow access to sensitive information and remote configure miner. You should set `access-token` and allow unrestricted access (`"restricted": false`).
+
+### GET /1/config
+
+Get current miner configuration. [Example](api/1/config.json).
+
+
+### PUT /1/config
+
+Update current miner configuration. Common use case, get current configuration, make changes, and upload it to miner.
+
+Curl example:
+
+```
+curl -v --data-binary @config.json -X PUT -H "Content-Type: application/json" -H "Authorization: Bearer SECRET" http://127.0.0.1:44444/1/config
+```