Twitter card not whitelisted

[thecorprato]

Hi

I own a site www.thecorporatetimes,in, made via wix.
I have added following meta tags in the header of the website, but when I validate, the validator gives a message’ WARN: NOT WHITELISTED’
Can you please help.

<meta name="twitter:card" content="summary_large_image">
<meta name="twitter:site" content="@corprato">
<meta name="twitter:creator" content="@corprato">
<meta name="twitter:title" content="India: Women's Day off on 8 March">
<meta name="twitter:description" content="8 March is an official holiday for women in our neighbor countries China (half day) and Nepal (full day, Nari - divas) and many other countries worldwide. Should corporate India also take this bold step?.">
<meta name="twitter:image" content="https://static.wixstatic.com/media/f7f2aa9ce2634eeb8fa9bcf6a494971d.jpg/v1/fill/w_627,h_353,al_c,q_80,usm_0.66_1.00_0.01/f7f2aa9ce2634eeb8fa9bcf6a494971d.webp">
<meta name="twitter:domain" content="http://www.thecorporatetimes.in/single-post/2017/03/03/Day-off-for-women-on-March-8">

[andypiper]

Sure, which of the steps in the pinned troubleshooting post are you having problems with?

[dnasleakim]

I’m having similar problems with https://iws.nu/

Curl gives: (angle brackets removed)
> curl -A Twitterbot https://iws.nu

!DOCTYPE html
html
head
  meta charset="utf-8"
  meta content="text/html; charset=UTF-8" name="Content-Type" 
  meta property="og:url" content="https://iws.nu/" 
  meta property="og:title" content="Infinite Whiteboard" 
  meta property="og:site_name" content="Infinite Whiteboard" 
  meta property="og:description" content="" 
  meta property="og:image" content="http://iws.nu/_screen/?d=1488564868686" 
  meta property="og:image:secure_url" content="https://iws.nu/_screen/?d=1488564868686" 
  meta property="og:image:width" content="1920" 
  meta property="og:image:height" content="1013" 
  meta property="og:type" content="website" 
  meta property="fb:app_id" content="388710587926740" 
  meta name="twitter:card" content="summary_large_image" 
  meta name="twitter:site" content="@infinify" 
  meta name="twitter:creator" content="@infinify" 
  meta name="twitter:title" content="" 
  meta name="twitter:description" content="Infinite Whiteboard - The real-time collaboration space" 
  meta name="twitter:image:alt" content="Infinite Whiteboard - The real-time collaboration space" 
  meta name="twitter:image" content="https://iws.nu/_screen/?d=1488564868686" 
/head
body/body

https://iws.nu/robots.txt contains

User-agent: Twitterbot
Disallow:

Card validator gives:

INFO:  Page fetched successfully
INFO:  9 metatags were found
WARN:  Not whitelisted

I have all the required properties as specified by https://dev.twitter.com/cards/types/summary-large-image

What is wrong/missing?

[dnasleakim]

Problem was missing this HTTP header:
content-type:text/html; charset=UTF-8

Then it complained on missing twitter:text:title tag, after adding non-empty value to twitter:text it now works.

[system]

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