====== DLNA HTTP ======

  * [[DLNA]]
  * [[DLNA HTTP Requests]]

My **working notes** on looking at DLNA headers.  Specific to my setup (minidlna, Sony BDP) only -- using the wiki as a location to keep notes.  Not meant to be useful for people who are not me. :)

Source: Episode ID 2002, 445063149 bytes, 425 MB

** Getcontentfeatures.Dlna.Org **

First HEAD request from DLNA client has this:

<code>
Getcontentfeatures.Dlna.Org: 1
</code>

Response from DLNA server is this:

<code>
Contentfeatures.Dlna.Org: DLNA.ORG_OP=01;DLNA.ORG_CI=0;DLNA.ORG_FLAGS=01700000000000000000000000000000
</code>

Using libdlna as a [[http://libdlna.sourcearchive.com/documentation/0.2.3/dlna_8h-source.html|reference]], it means that mine supports HTTP Range requests.

<code>
/* DLNA.ORG_OP: operations parameter (string)
 *     "00" (or "0") neither time seek range nor range supported
 *     "01" range supported
 *     "10" time seek range supported
 *     "11" both time seek range and range supported
 */
</code>

  * ** DLNA.ORG_OP=01 ** HTTP Range requests supported
  * ** DLNA.ORG_CI=0 ** media is not transcoded
  * ** DLNA.ORG_FLAGS=01700000 plus 24 trailing zeroes**: ''dlnaVersion15Supported'', ''connectionStallingSupported'', ''backgroundTransferModeSupported'', ''streamingTransferModeSupported''
    * Supports DLNA version 1.5 (2006 spec)

** HEAD Requests **

Worth noting that the DLNA client sends three total HEAD requests.  They are identical, except the first one also includes a ''User-Agent'' string:

<code>
User-Agent: UPnP/1.0 DLNADOC/1.50
</code>

<code>
Request Method: HEAD
Request Url: /MediaItems/224.mkv
User-Agent: UPnP/1.0 DLNADOC/1.50
Host: 10.10.10.103:8200
Accept: */*
X-Av-Physical-Unit-Info: pa="Blu-ray Disc Player"
X-Av-Client-Info: av=5.0; cn="Sony Corporation"; mn="Blu-ray Disc Player"; mv="2.0"
Getcontentfeatures.Dlna.Org: 1
</code>

** realTimeInfo.dlna.org: DLNA.ORG_TLAG=* **

minidlna always sends the header, safe to ignore it (see upnphttp.c)