HTTP Request to get slide show

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Andy Buckingham

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Aug 9, 2016, 4:32:27 AM8/9/16
to RadioVIS developers
(this discussion has been moved from RadioDNS Developers)

Hi Furhad,

Which server (host/port) are you trying to request slideshow from? This appears to missing from your example.

Have you performed a RadioDNS lookup first to find the correct server for your HTTP request? This involves following the steps defined in the RadioDNS specification:


As a worked example using your original request:

1. It appears you are trying to resolve slideshow for `fm:ce1.c479.09580` which resolves to `rdns.musicradio.com`
2. Performing a lookup for RadioVIS over HTTP (`_radiovis-http._tcp.rdns.musicradio.com`) resolves to `vis-http.musicradio.com:80`
3. Performing a request against this server with the request you supplied, gets the following response:

``

{"headers":{"RadioVIS-Message-ID":"ID:lqctwebnode2-37432-1464945283443-2:8993180:-1:1:154117856","RadioVIS-Destination":"/topic/fm/ce1/c479/09580/image","RadioVIS-Link":"http://www.capitalfm.com/london/on-air/last-10-songs/","RadioVIS-Trigger-Time":"NOW"},"body":"SHOW http://slideshow.musicradio.com/slides/GCap_Media/One_Network/Capital_Radio/NowPlaying_807928.jpg"}
``

This is the expected initial RadioVIS payload for this radio station.

Hope this helps.

Andy.


> Date: Mon, 8 Aug 2016 15:21:24 -0700 (PDT)
> From: Furhad Jidda
> To: RadioDNS developers
> Subject: [RadioDNS-Dev] HTTP Request to get slide show
> 
> Hi ,
>     I am trying to follow the ETSI document # 103 270 V1.2.1 (2015-09) to 
> get the slide show images over IP using HTTP protocol but I keep receiving 
> below error. Has anyone ever seen this issue before ? Is there something I 
> am doing wrong ?
> 
> http requests
> My http request looks like 
> */radiodns/vis/vis.json?topic=/topic/fm/ce1/c479/09580/image*
> 
> 
> Something went wrong - The remote end-point returned an error - HTTP Code - 
> 302
> HTTP/1.1 302 Found
> Cache-Control: private
> Content-Type: text/html; charset=utf-8
> Date: Mon, 08 Aug 2016 22:15:30 GMT
> Server: Microsoft-IIS/8.0
> X-Powered-By: ASP.NET
> Content-Length: 183
> Connection: keep-alive
> 
> =============
> 
> <html><head><title>Object 
> moved</title></head><body>
> <h2>Object moved to <a 
> </body></html>

Furhad Jidda

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Aug 9, 2016, 10:12:21 AM8/9/16
to RadioVIS developers
Hi Andy,
    Thank you so much. That does help . But I do not see in the document(link that you gave) how to perform this look up , I see this however in the old version (RVIS01-v1.1.01) which I though should not be referred . Am I missing something here ?

Thanks,
Furhad J.

Andy Buckingham

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Aug 9, 2016, 10:20:55 AM8/9/16
to RadioVIS Developers
Hi Furhad,

There are 2 specifications involved in this process:

* Section 5 of ETSI TS 103 270 V1.2.1 (RadioDNS) details the construction of the RadioDNS FQDN to perform the authoritative FQDN lookup (Step 1 in my worked example below).
* Section 7 of ETSI TS 101 499 V3.1.1 (Slideshow) details the application discovery element (Step 2 in my worked example below).

The RadioDNS element in 103 270 is common across slideshow, SPI, RadioTAG and more, hence it sits standalone. The slideshow specific bits sit within the Slideshow specification.

I hope that explains things a little further.

Andy.


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Furhad Jidda

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Aug 9, 2016, 11:38:01 AM8/9/16
to RadioVIS developers
Hi Andy,
   Thank you very much .That does make senses now .Sorry I missed that before.

Thank you so much for helping me out.

Thanks ,
Furhad J.
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