# MediaTailor HLS implicit session initialization
<a name="manifest-query-parameters-hls-implicit-session-initialization"></a>

AWS Elemental MediaTailor includes query parameters in links to MediaTailor resources when your request includes query parameters with the key `manifest.*`. The following example shows this request format:

```
GET /v1/master/111122223333/originId/index.m3u8?manifest.test=123&other=456
```

Links don't include the `manifest.` prefix.

**Parameter application in HLS**  
For HLS implicit sessions, MediaTailor applies parameters to the following locations in the manifest hierarchy:
+ Multivariant playlist URLs
+ Media playlist URLs
+ Content segment URLs
+ Ad segment URLs
+ HLS initialization URLs

**Example multivariant playlist**  
The following example shows how MediaTailor includes the query parameters in the URL for the multivariant playlist:  

```
#EXTM3U
#EXT-X-VERSION:3
#EXT-X-INDEPENDENT-SEGMENTS
#EXT-X-MEDIA:LANGUAGE="eng",AUTOSELECT=YES,FORCED=NO,TYPE=SUBTITLES,URI="../../../manifest/111122223333/originId/session/1.m3u8?test=123",GROUP-ID="subtitles",DEFAULT=YES,NAME="caption_1"
#EXT-X-STREAM-INF:CODECS="avc1.640029,mp4a.40.2",AVERAGE-BANDWIDTH=2525657,RESOLUTION=960x540,SUBTITLES="subtitles",FRAME-RATE=29.97,BANDWIDTH=2665212
../../../manifest/111122223333/originId/session/0.m3u8?test=123
```

**Example media playlist**  
The following example shows how MediaTailor includes the query parameters in the URLs for the content segments:  

```
#EXTM3U
#EXT-X-VERSION:6
#EXT-X-TARGETDURATION:7
#EXT-X-MEDIA-SEQUENCE:28716269
#EXT-X-DISCONTINUITY-SEQUENCE:0
#EXTINF:6.006,
https://origin.com/contentSegment_1.ts?originQueryParam=foo&test=123
#EXT-X-DISCONTINUITY
#EXTINF:6.006,
../../../../segment/111122223333/originId/session/0/2?test=123
```