Last-Modified headers on national rail knowledge base feeds

[Ceri Storey]

Hi,

The knowledge base feeds (as described at http://www.nationalrail.co.uk/100298.aspx or http://nrodwiki.rockshore.net/index.php/KnowledgeBase) are advertised as publishing a Last-Modified: header field, to allow efficient polling; but unfortunately, I can't see that this is the case. As an example with curl:

: cez@Ceri-no-Mac-mini; curl -vs -H X-Auth-Token:my-token-goes-here https://datafeeds.nationalrail.co.uk/api/staticfeeds/4.0/serviceIndicators > /dev/null

*   Trying 54.77.164.226...

* Connected to datafeeds.nationalrail.co.uk (54.77.164.226) port 443 (#0)

* TLS 1.0 connection using TLS_DHE_RSA_WITH_AES_256_CBC_SHA

* Server certificate: datafeeds.nationalrail.co.uk

* Server certificate: Symantec Class 3 Secure Server CA - G4

* Server certificate: VeriSign Class 3 Public Primary Certification Authority - G5

> GET /api/staticfeeds/4.0/serviceIndicators HTTP/1.1

> Host: datafeeds.nationalrail.co.uk

> User-Agent: curl/7.43.0

> Accept: */*

> X-Auth-Token:my-token-goes-here

>

< HTTP/1.1 200 OK

< Date: Sat, 03 Jun 2017 11:07:59 GMT

< Server: Apache-Coyote/1.1

< Cache-Control: no-cache, no-store, max-age=0, must-revalidate

< Pragma: no-cache

< Expires: 0

< X-XSS-Protection: 1; mode=block

< X-Frame-Options: DENY

< X-Content-Type-Options: nosniff

< Content-Type: text/plain;charset=ISO-8859-1

< Content-Length: 9960

< Connection: close

<

{ [7668 bytes data]

* Closing connection 0

: cez@Ceri-no-Mac-mini;

I'm expecting to see a "Last-Modified:" header in the response, that I can use in concert with the "If-Modified-Since" request header to avoid re-fetching the data if it's not changed.

Cheers,

[Omar Gulam]

Hi,

Apologies, this is an error, the "Last-Modified" field does not get published. The wiki page has now been updated to reflect this.

Thanks

Regards,

Omar