Updated Filer Server API (markdown)

Filer-Server-API.md

@@ -39,6 +39,10 @@ You can append to any HTTP API with &pretty=y to see a formatted json output.
 | header: `Content-Type` | used for auto compression | empty |
 | header: `Content-Disposition` | used as response content-disposition | empty |
 | prefixed header: `Seaweed-` | example: `Seaweed-name1: value1`. Returned as `Seaweed-Name1: value1` in GET/HEAD response header. | empty |
+
+| GET Parameter | Description | Default |
+| ---- | -- | -- |
+| metadata| get file metadata | empty |
 ### notice
 * It is recommended to add retries when writing to Filer.
 * `AutoChunking` is not supported for method `PUT`. If the file length is greater than 256MB, only the leading 256MB in the `PUT` request will be saved.
@@ -61,7 +65,6 @@ Examples:
 > curl -T test.yaml http://localhost:8888/test.yaml?op=append                         # append to an file by PUT
 {"name":"test.yaml","size":866}
 > curl -H "Accept: application/json" "http://localhost:8888/javascript/?pretty=y"            # list all files under /javascript/
-curl -H "Accept: application/json" "http://localhost:8888/javascript/?pretty=y"
 {
   "Path": "/javascript",
   "Entries": [
@@ -118,6 +121,46 @@ curl -H "Accept: application/json" "http://localhost:8888/javascript/?pretty=y"
   "LastFileName": "jquery-sparklines",
   "ShouldDisplayLoadMore": false
 }
+# get file metadata
+> curl 'http://localhost:8888/test01.py?metadata&pretty=yes'
+{
+  "FullPath": "/test01.py",
+  "Mtime": "2022-01-09T19:11:18+08:00",
+  "Crtime": "2022-01-09T19:11:18+08:00",
+  "Mode": 432,
+  "Uid": 1001,
+  "Gid": 1001,
+  "Mime": "text/x-python",
+  "Replication": "",
+  "Collection": "",
+  "TtlSec": 0,
+  "DiskType": "",
+  "UserName": "",
+  "GroupNames": null,
+  "SymlinkTarget": "",
+  "Md5": "px6as5eP7tF5YcgAv5m60Q==",
+  "FileSize": 1992,
+  "Extended": null,
+  "chunks": [
+    {
+      "file_id": "17,04fbb55507b515",
+      "size": 1992,
+      "mtime": 1641726678984876713,
+      "e_tag": "px6as5eP7tF5YcgAv5m60Q==",
+      "fid": {
+        "volume_id": 17,
+        "file_key": 326581,
+        "cookie": 1426568469
+      },
+      "is_compressed": true
+    }
+  ],
+  "HardLinkId": null,
+  "HardLinkCounter": 0,
+  "Content": null,
+  "Remote": null,
+  "Quota": 0
+}
 ```
 ### GET files