Song API

This document is based on the following source files:

internal/handlers/music.go -- Song CRUD, playback stream, covers, lyrics, tag writing, file organization, and duplicate detection handlers
internal/handlers/hls.go -- HLS radio reverse proxy handler (playlist rewriting + segment passthrough)
internal/app/routers.go -- Song-related route registration
internal/models/models.go -- Song / BatchDeleteSongsRequest / BatchDeleteSongsResponse
internal/models/lyric.go -- LyricPayload
internal/services/song_service.go -- OrganizeItem / OrganizeResult / CleanResult

Overview
List and Query
Create, Update, Delete
Lyrics and Tags
File Organization
- POST /songs/organize -- Batch Organize Files
- POST /songs/organize/preview -- Preview Batch Organization
Playback and Media
HLS Reverse Proxy
- GET /songs/{id}/hls/playlist -- Proxy Playlist
- GET /songs/{id}/hls/segment -- Proxy Segment

1. Overview

Section source: internal/handlers/music.go, internal/app/routers.go

The song management module is Songloft's core API, covering song CRUD, playback stream distribution, covers/lyrics, audio tag writing, file organization, and duplicate detection. All endpoints require JWT authentication (BearerAuth), with the base path /api/v1.

Song types: local (local files), remote (external URL / plugin source), radio (online broadcast / live stream).

Song JSON serialization rules (handled uniformly by MarshalJSON):

url -- Unified to /api/v1/songs/{id}/play (HLS radio uses .../play.m3u8)
cover_url -- /api/v1/songs/{id}/cover when a cover exists, otherwise empty
lyric_url -- /api/v1/songs/{id}/lyric when lyrics exist, otherwise empty
source_url -- The original stream address, returned only for remote/radio types

Some read-only fields (returned with the Song object in details/lists):

is_live -- Whether it is a live stream (semantics apply only to the remote type)
is_video -- bool, whether it contains a real video track (probed by ffprobe during scanning, excluding cover-only images); the client uses this to render video / choose the casting MIME (introduced by the 0024 migration)

Error response format: {"error":"...", "detail":"..."} (detail is optional).

2. List and Query

Section source: internal/handlers/music.go, internal/database/filters.go

2.1 GET /songs -- Paginated List

Path: /api/v1/songs | Authentication: BearerAuth

Gets the song list, supporting filtering by type, keyword search, path-prefix filtering, and pagination.

Query parameters:

Parameter	Type	Required	Default	Description
`type`	string	No	--	`local` / `remote` / `radio`
`keyword`	string	No	--	Search keyword (matches title, artist, album)
`path_prefix`	string	No	--	Filter by `file_path` prefix
`limit`	int	No	`20`	Items per page, upper limit `100000`
`offset`	int	No	`0`	Offset

Success response (200): {"songs": [Song...], "total": 100, "limit": 20, "offset": 0}

Errors: 500 Failed to get song list / total

2.2 GET /songs/ids -- ID List

Path: /api/v1/songs/ids | Authentication: BearerAuth

Shares filter conditions with /songs (type, keyword, path_prefix), but returns only IDs. Used for batch operation scenarios such as "select all within the current filter range"; not paginated.

Success response (200): {"ids": [1, 2, 3], "total": 3}

Errors: 500 Failed to get song ID list

2.3 GET /songs/duplicates -- Duplicate Detection

Path: /api/v1/songs/duplicates | Authentication: BearerAuth

Queries groups of local songs with identical content via audio fingerprints (Chromaprint). Fingerprint computation must be completed first (POST /scan/fingerprints) — auto-computing fingerprints after a scan is off by default (see /settings/scan-auto-fingerprint). Only the first 120 seconds of each song are sampled, so songs within one fingerprint are further clustered by full-file length with a 30-second tolerance (adjacent comparison; unknown length never splits) to rule out "shared intro" collisions.

Success response (200):

json

{
  "groups": [
    {
      "fingerprint": "AQADtNIyR...",
      "songs": [
        {"id": 1, "title": "夜曲", "artist": "周杰伦", "album": "十一月的萧邦",
         "duration": 253.5, "file_path": "/music/夜曲.mp3", "format": "mp3",
         "bit_rate": 320, "file_size": 10485760, "cover_url": "/api/v1/songs/1/cover",
         "added_at": "2024-01-01T12:00:00Z"}
      ]
    }
  ],
  "total_groups": 1,
  "total_duplicates": 2
}

Errors: 500 Failed to query duplicate songs

Path: /api/v1/songs/facets | Authentication: BearerAuth

Aggregates the library by a specified dimension, returning the non-empty values under that dimension, the song count for each, and the cover URL of one representative song, used for the card grid of "browse by category". After obtaining a value, use /songs?<field>=<value> to fetch songs under that category.

Query parameters:

Parameter	Type	Required	Default	Description
`field`	string	Yes	--	Aggregation dimension: `genre` / `artist` / `album` / `language` / `style` / `year` / `decade` (the value for `year`/`decade` is a numeric string; a decade such as `"1990"` means 1990-1999)
`keyword`	string	No	--	Fuzzy search over values
`limit`	int	No	`20`	Page size, upper limit `100000`
`offset`	int	No	`0`	Pagination offset
`sort`	string	No	`count`	Sort dimension: `count` / `name`
`order`	string	No	--	Sort direction: `asc` / `desc` (`count` defaults to `desc`, `name` defaults to `asc`)

Success response (200):

json

{
  "field": "artist",
  "facets": [
    {"value": "周杰伦", "count": 42, "cover_url": "/api/v1/songs/1/cover"}
  ],
  "total": 128,
  "limit": 20,
  "offset": 0
}

total is the total number of distinct values for that dimension.

Errors: 400 Missing or unsupported field | 500 Server error

3. Create, Update, Delete

Section source: internal/handlers/music.go, internal/models/models.go

3.1 GET /songs/{id} -- Get Details

Path: /api/v1/songs/{id} | Authentication: BearerAuth

Path parameter: id (int, required) -- Song ID

Success response (200): The full Song object.

Errors: 400 Invalid ID | 404 Song does not exist

3.2 PUT /songs/{id} -- Update Song

Path: /api/v1/songs/{id} | Authentication: BearerAuth

Path parameter: id (int, required)

Request body:

Field	Type	Required	Description
`title`	string	Yes	Title (cannot be empty)
`artist`	string	No	Artist
`album`	string	No	Album
`url`	string	Conditionally required	Playback address (required for non-local songs)
`cover_url`	string	No	Cover URL
`is_live`	bool	No	Whether it is a live stream (applies only to the remote type)

Success response (200): The updated Song object.

Errors: 400 Invalid ID / empty title / empty URL | 404 Does not exist | 500 Update failed

3.3 DELETE /songs/{id} -- Delete Song

Path: /api/v1/songs/{id} | Authentication: BearerAuth

Path parameter: id (int, required)

Success response (200): {"message": "歌曲已删除"}

Errors: 400 Invalid ID | 500 Delete failed

3.4 POST /songs/remote -- Add Remote Songs

Path: /api/v1/songs/remote | Authentication: BearerAuth

Batch-adds network songs. Each entry must provide at least a url or the plugin_entry_path + source_data combination.

Request body (array):

Field	Type	Required	Description
`url`	string	Conditional	Direct audio link (for pure external links; leave empty for plugin sources)
`title`	string	Yes	Title
`artist`	string	No	Artist
`album`	string	No	Album
`cover_url`	string	No	Cover URL
`duration`	number	No	Duration (seconds)
`plugin_entry_path`	string	Conditional	Plugin entryPath (e.g., `"subsonic"`)
`source_data`	string	Conditional	Plugin source metadata JSON
`dedup_key`	string	No	Deduplication key (e.g., `"nas1:001234"`); no deduplication when empty
`lyric`	string	No	Lyric content or URL
`lyric_source`	string	No	Lyric source type

Success response (201): {"songs": [Song...], "count": 2}

Errors: 400 Invalid request / empty list / empty title / missing source identifier | 500 Add failed

3.5 POST /songs/radio -- Add Radio

Path: /api/v1/songs/radio | Authentication: BearerAuth

Batch-adds radio/broadcast stations.

Request body (array):

Field	Type	Required	Description
`url`	string	Yes	Radio stream address
`title`	string	Yes	Radio name
`artist`	string	No	Description
`cover_url`	string	No	Cover URL

Success response (201): {"songs": [Song...], "count": 1}

Errors: 400 Invalid request / empty list / empty URL or title | 500 Add failed

3.6 POST /songs/batch-delete -- Batch Delete

Path: /api/v1/songs/batch-delete | Authentication: BearerAuth

Request body:

Field	Type	Required	Description
`ids`	int64[]	Yes	List of song IDs to delete
`delete_files`	bool	No	Whether to also delete local audio files (default `false`)

Success response (200): {"deleted": 3}

Errors: 400 Invalid request / empty ID list | 500 Delete failed

3.7 POST /songs/clean -- Clean Invalid Songs

Path: /api/v1/songs/clean | Authentication: BearerAuth

Cleans up records of local songs whose files no longer exist or reside in excluded directories, and deletes the associated cover files.

Success response (200):

json

{"message": "清理完成", "total": 5, "file_not_found": 3, "in_excluded_dir": 2}

Errors: 500 Clean failed

3.8 Remote Song Metadata Refresh

For all remote songs with missing metadata, probes duration, bit rate, sample rate, format, and tags via ffprobe and backfills them, executed asynchronously.

POST /songs/refresh-metadata -- Start Refresh

Path: /api/v1/songs/refresh-metadata | Authentication: BearerAuth

Success response (202): {"status": "started"}

Errors: 409 Already running | 500 Refresher not configured / start failed

GET /songs/refresh-metadata/progress -- Query Progress

Path: /api/v1/songs/refresh-metadata/progress | Authentication: BearerAuth

Success response (200): MetadataRefreshProgress (contains fields such as status; returns {"status": "idle"} when not configured).

POST /songs/refresh-metadata/cancel -- Cancel Refresh

Path: /api/v1/songs/refresh-metadata/cancel | Authentication: BearerAuth

Success response: 204 No Content (idempotent; also returns 204 when there is no task).

4. Lyrics and Tags

Section source: internal/handlers/music.go, internal/models/lyric.go

4.1 PUT /songs/{id}/lyrics -- Update Lyrics

Path: /api/v1/songs/{id}/lyrics | Authentication: BearerAuth

Updates the lyric content and source. The input shape is determined by lyric_source:

"url" -- Pass lyric_remote_url, fetched lazily at runtime
Others (scraped/file/embedded/cached/manual) -- Pass lyric/tlyric/rlyric/lxlyric

lyric_source=manual marks a user's manual adjustment; a scanner re-scan will not overwrite it.

Path parameter: id (int, required)

Request body:

Field	Type	Required	Description
`lyric_source`	string	No	Source type
`lyric`	string	Conditional	Main lyrics LRC (non-url source)
`tlyric`	string	No	Translated lyrics
`rlyric`	string	No	Romanized lyrics
`lxlyric`	string	No	Word-by-word lyrics
`lyric_remote_url`	string	Conditional	Remote lyrics URL (url source)

Success response (200): {"message": "歌词已更新", "file_write_status": "written"}

file_write_status: written / unchanged / skipped / failed

Errors: 400 Invalid ID / invalid request | 404 Song does not exist | 500 Update failed

4.2 GET /songs/{id}/lyric -- Get Lyrics

Path: /api/v1/songs/{id}/lyric | Authentication: BearerAuth

Returns a LyricPayload JSON. Internally dispatches to database unpacking or remote URL fetching based on lyric_source.

Path parameter: id (int, required)

Success response (200):

json

{"lyric": "[00:00.00]夜曲...", "tlyric": "", "rlyric": "", "lxlyric": ""}

Errors: 400 Invalid ID | 404 Song/lyrics do not exist | 502 Remote fetch failed

4.3 PUT /songs/{id}/tags -- Write Audio Tags

Path: /api/v1/songs/{id}/tags | Authentication: BearerAuth

Writes metadata to the database and the local audio file tags (local songs only). Non-empty fields overwrite; empty values are preserved. cover_data (base64) takes precedence over cover_url.

Path parameter: id (int, required)

Request body:

Field	Type	Required	Description
`title`	string	No	Title
`artist`	string	No	Artist
`album`	string	No	Album
`year`	int	No	Year (overwrites when >0)
`genre`	string	No	Genre
`lyrics`	string	No	Lyrics LRC (after writing, `lyric_source=manual`)
`cover_data`	string	No	Cover base64 (takes precedence)
`cover_url`	string	No	Cover URL (written after download)
`clear_cover`	bool	No	Explicitly clears the cover

Success response (200): {"song": Song, "file_write": "written"}

file_write: written / unchanged / skipped / failed / unsupported

Errors: 400 Invalid ID / non-local song / invalid base64 | 404 Does not exist | 500 Update failed

5. File Organization

Section source: internal/handlers/music.go, internal/services/song_service.go

5.1 POST /songs/organize -- Batch Organize Files

Path: /api/v1/songs/organize | Authentication: BearerAuth

Batch-moves/renames local song files. target_path is a path relative to music_path (including directory and file name), and the extension must match the original file.

Request body (array):

Field	Type	Required	Description
`id`	int64	Yes	Song ID
`target_path`	string	Yes	Target path (relative to `music_path`)

Success response (200):

json

[
  {"id": 1, "status": "ok", "file_path": "/music/周杰伦/夜曲.mp3"},
  {"id": 2, "status": "error", "error": "not a local song"}
]

Errors: 400 Invalid request / empty list / music_path not set | 500 Not configured

5.2 POST /songs/organize/preview -- Preview Batch Organization

Path: /api/v1/songs/organize/preview | Authentication: BearerAuth

Dry-run preview of directory organization changes; does not move any files or modify the database. Returns each item's old_path→new_path and status. target_path is a path relative to music_path (music_path is obtained by the server itself). CUE songs return skip; a target that already exists or a name collision within the batch returns conflict.

Request body (array): Same as /songs/organize (id + target_path).

Success response (200): An array of OrganizePreviewResult, each item containing status (ok / conflict / skip / error), old_path, and new_path.

Errors: 400 Invalid request / empty list

6. Playback and Media

Section source: internal/handlers/music.go

6.1 POST /songs/{id}/activate -- Activate/Prefetch

Path: /api/v1/songs/{id}/activate | Authentication: BearerAuth

Called by the client before switching songs. The backend cancels in-progress work for other songs in the same session (prefetch / transcode / reassign), yielding the plugin worker and transcode semaphore to the new song. Idempotent; other client sessions are not affected.

Path parameter: id (int, required)

Success response: 204 No Content

Errors: 400 Invalid song_id

6.2 POST /songs/{id}/played -- Play Event Notification

Path: /api/v1/songs/{id}/played | Authentication: BearerAuth

Called by the client when a song starts playing, finishes playing, or is skipped; the backend broadcasts the event to JS plugins that have subscribed to play events (registered via songloft.events.onPlayEvent).

Path parameter: id (int, required)

Query parameters:

Parameter	Type	Required	Description
`source`	string	No	Caller source identifier, e.g., `songloft-player` (official client), `miot` (Xiao AI speaker plugin)
`type`	string	No	Event type: `play` (start playing) / `finish` (finished playing, default) / `skip` (user skipped)
`context_type`	string	No	Playback context type, only effective when `type=play`: `playlist` or a facet dimension (`artist`/`album`/`genre`/`year`/`decade`/`language`/`style`)
`context_key`	string	No	Playback context identifier, only effective when `type=play`: playlist ID for `playlist`, the dimension value (e.g. artist name) for facets

Side effect: when type=play and a valid context_type + context_key are both supplied, the song is additionally written to that context's play history (deduplicated by song within the context, keeping only the most recent 50 entries). A write failure is only logged and does not affect the status code. See Play History API.

Only type=play is persisted: finish is redundant information about the same song, while skip reports the previous song, whose context may already have switched on the client, filing it under the wrong context.

Success response: 204 No Content

Errors: 400 Invalid song ID / illegal event type | 404 Song does not exist

6.3 GET /songs/{id}/play -- Playback Stream

Path: /api/v1/songs/{id}/play | Method: GET / HEAD | Authentication: BearerAuth

Streams audio by song ID, internally dispatching automatically by song.type:

Type	Behavior
`local`	`ServeFile` (supports Range/seek)
`remote` (plugin)	Returned after CacheService download caching
`remote` (external link)	Directly proxied and forwarded
`radio` (HLS)	Reverse proxy or 302 (depending on the hls-proxy switch)
`radio` (non-HLS)	Directly proxies the upstream stream

Path parameter: id (int, required)

Query parameters:

Parameter	Type	Description
`format`	string	Target format (e.g., `opus`); when different, goes through ffmpeg transcoding
`prefetch`	string	When `"1"`, prewarms asynchronously and returns 202 immediately

Success: 200 Audio stream | 202 Prefetch triggered | 206 Range partial content | 302 HLS redirect

Errors: 400 Invalid ID | 404 Does not exist | 502 Source unavailable

6.4 GET /songs/{id}/play.m3u8 -- HLS Alias

Path: /api/v1/songs/{id}/play.m3u8 | Method: GET / HEAD | Authentication: BearerAuth

An HLS-radio-specific alias that shares the handler with /play. Ending the URL with .m3u8 makes ExoPlayer/AVPlayer correctly select the HlsMediaSource. The client automatically obtains the correct URL via Song.PlaybackURL(). Parameters and responses are the same as 6.3.

6.5 GET /songs/{id}/cover -- Cover

Path: /api/v1/songs/{id}/cover | Authentication: BearerAuth

Gets the cover image. Returns the local cover first, and proxies the external CoverURL when it does not exist.

Path parameter: id (int, required)

Success response (200): Image binary, with Content-Type set automatically by extension (jpeg/png/gif/bmp/webp), Cache-Control: public, max-age=31536000.

Errors: 400 Invalid ID | 404 Song/cover does not exist | 500 Read failed

7. HLS Reverse Proxy

Section source: internal/handlers/hls.go

The HLS reverse proxy takes effect after the hls_proxy switch is enabled (PUT /settings/hls-proxy). Flow: serveRadio -> ServeProxy fetches the upstream m3u8 and rewrites URIs to local relative paths -> the player calls back playlist/segment to fetch sub-layer resources. Each entry performs a same-origin check + IsHostnameAllowed SSRF protection; non-same-origin URLs are left unchanged.

7.1 GET /songs/{id}/hls/playlist -- Proxy Playlist

Path: /api/v1/songs/{id}/hls/playlist | Method: GET / HEAD | Authentication: BearerAuth

Reverse-proxies the HLS sub-layer m3u8. Fetch upstream -> same-origin check -> rewrite URIs -> write back. Upstream errors are passed through; the playlist size limit is 1 MB.

Parameters: id (path, int) | u (query, string, required, base64url-encoded upstream URL) | access_token (query, string, optional)

Success (200): Rewritten m3u8 text, Content-Type: application/vnd.apple.mpegurl, Cache-Control: no-store

Errors: 400 Invalid ID / missing u | 403 Non-same-origin / host not allowed | 404 Song does not exist | 502 Upstream unavailable

7.2 GET /songs/{id}/hls/segment -- Proxy Segment

Path: /api/v1/songs/{id}/hls/segment | Method: GET / HEAD | Authentication: BearerAuth

Reverse-proxies audio segments/key/init segments. Passes through Range and upstream response headers.

Parameters: id (path, int) | u (query, string, required, base64url-encoded upstream URL) | access_token (query, string, optional)

Success: 200 Segment content | 206 Range partial content. Cache-Control: no-store

Errors: 400 Invalid ID / missing u | 403 Non-same-origin / host not allowed | 404 Song does not exist | 502 Upstream unavailable

API Reference

Backend System Design

Plugin System Design

Core Feature Implementation

Song API

Table of Contents

1. Overview

2. List and Query

2.1 GET /songs -- Paginated List

2.2 GET /songs/ids -- ID List

2.3 GET /songs/duplicates -- Duplicate Detection

2.4 GET /songs/facets -- Facet Aggregation

3. Create, Update, Delete

3.1 GET /songs/{id} -- Get Details

3.2 PUT /songs/{id} -- Update Song

3.3 DELETE /songs/{id} -- Delete Song

3.4 POST /songs/remote -- Add Remote Songs

3.5 POST /songs/radio -- Add Radio

3.6 POST /songs/batch-delete -- Batch Delete

3.7 POST /songs/clean -- Clean Invalid Songs

3.8 Remote Song Metadata Refresh

POST /songs/refresh-metadata -- Start Refresh

GET /songs/refresh-metadata/progress -- Query Progress

POST /songs/refresh-metadata/cancel -- Cancel Refresh

4. Lyrics and Tags

4.1 PUT /songs/{id}/lyrics -- Update Lyrics

4.2 GET /songs/{id}/lyric -- Get Lyrics

4.3 PUT /songs/{id}/tags -- Write Audio Tags

5. File Organization

5.1 POST /songs/organize -- Batch Organize Files

5.2 POST /songs/organize/preview -- Preview Batch Organization

6. Playback and Media

6.1 POST /songs/{id}/activate -- Activate/Prefetch

6.2 POST /songs/{id}/played -- Play Event Notification

6.3 GET /songs/{id}/play -- Playback Stream

6.4 GET /songs/{id}/play.m3u8 -- HLS Alias

6.5 GET /songs/{id}/cover -- Cover

7. HLS Reverse Proxy

7.1 GET /songs/{id}/hls/playlist -- Proxy Playlist

7.2 GET /songs/{id}/hls/segment -- Proxy Segment

Song API ​

Table of Contents ​

1. Overview ​

2. List and Query ​

2.1 GET /songs -- Paginated List ​

2.2 GET /songs/ids -- ID List ​

2.3 GET /songs/duplicates -- Duplicate Detection ​

2.4 GET /songs/facets -- Facet Aggregation ​

3. Create, Update, Delete ​

3.1 GET /songs/{id} -- Get Details ​

3.2 PUT /songs/{id} -- Update Song ​

3.3 DELETE /songs/{id} -- Delete Song ​

3.4 POST /songs/remote -- Add Remote Songs ​

3.5 POST /songs/radio -- Add Radio ​

3.6 POST /songs/batch-delete -- Batch Delete ​

3.7 POST /songs/clean -- Clean Invalid Songs ​

3.8 Remote Song Metadata Refresh ​

POST /songs/refresh-metadata -- Start Refresh ​

GET /songs/refresh-metadata/progress -- Query Progress ​

POST /songs/refresh-metadata/cancel -- Cancel Refresh ​

4. Lyrics and Tags ​

4.1 PUT /songs/{id}/lyrics -- Update Lyrics ​

4.2 GET /songs/{id}/lyric -- Get Lyrics ​

4.3 PUT /songs/{id}/tags -- Write Audio Tags ​

5. File Organization ​

5.1 POST /songs/organize -- Batch Organize Files ​

5.2 POST /songs/organize/preview -- Preview Batch Organization ​

6. Playback and Media ​

6.1 POST /songs/{id}/activate -- Activate/Prefetch ​

6.2 POST /songs/{id}/played -- Play Event Notification ​

6.3 GET /songs/{id}/play -- Playback Stream ​

6.4 GET /songs/{id}/play.m3u8 -- HLS Alias ​

6.5 GET /songs/{id}/cover -- Cover ​

7. HLS Reverse Proxy ​

7.1 GET /songs/{id}/hls/playlist -- Proxy Playlist ​

7.2 GET /songs/{id}/hls/segment -- Proxy Segment ​

Song API

Table of Contents

1. Overview

2. List and Query

2.1 GET /songs -- Paginated List

2.2 GET /songs/ids -- ID List

2.3 GET /songs/duplicates -- Duplicate Detection

2.4 GET /songs/facets -- Facet Aggregation

3. Create, Update, Delete

3.1 GET /songs/{id} -- Get Details

3.2 PUT /songs/{id} -- Update Song

3.3 DELETE /songs/{id} -- Delete Song

3.4 POST /songs/remote -- Add Remote Songs

3.5 POST /songs/radio -- Add Radio

3.6 POST /songs/batch-delete -- Batch Delete

3.7 POST /songs/clean -- Clean Invalid Songs

3.8 Remote Song Metadata Refresh

POST /songs/refresh-metadata -- Start Refresh

GET /songs/refresh-metadata/progress -- Query Progress

POST /songs/refresh-metadata/cancel -- Cancel Refresh

4. Lyrics and Tags

4.1 PUT /songs/{id}/lyrics -- Update Lyrics

4.2 GET /songs/{id}/lyric -- Get Lyrics

4.3 PUT /songs/{id}/tags -- Write Audio Tags

5. File Organization

5.1 POST /songs/organize -- Batch Organize Files

5.2 POST /songs/organize/preview -- Preview Batch Organization

6. Playback and Media

6.1 POST /songs/{id}/activate -- Activate/Prefetch

6.2 POST /songs/{id}/played -- Play Event Notification

6.3 GET /songs/{id}/play -- Playback Stream

6.4 GET /songs/{id}/play.m3u8 -- HLS Alias

6.5 GET /songs/{id}/cover -- Cover

7. HLS Reverse Proxy

7.1 GET /songs/{id}/hls/playlist -- Proxy Playlist

7.2 GET /songs/{id}/hls/segment -- Proxy Segment