Facebook Open Graph Error - Inferred Property

Question

I m trying to implement Facebook s OpenGRaph protocol on my product pages   On each page i have this above the head section    lt html xmlns  http   www w3 org 1999 xhtml  xmlns og  http   ogp me ns   xmlns fb  http   www facebook com 2008 fbml  gt    Then within the head section i have    lt meta property  og title  content  This Page Title   gt   lt meta property  og type  content  product   gt   lt meta property  og url  content  http   www mywebaddress com   gt   lt meta property  og image  content  http   www myimage jpg   gt   lt meta property  og site name  content  My Site Name   gt   lt meta property  fb admins  content  10101010101   gt   lt meta property  og email  content  hello mywebaddress com   gt   lt meta property  og description  content  Description of my product    gt    I then have a  like  button with this code              lt script gt  function d  s  id            var js  fjs   d getElementsByTagName s  0           if  d getElementById id    return           js   d createElement s   js id   id          js src      connect facebook net en US all js xfbml 1           fjs parentNode insertBefore js  fjs             document   script    facebook-jssdk     lt  script gt           lt div class  fb-like  data-href  http   thispagesurl  data-send  true  data-width  350  data-show-faces  false  gt  lt  div gt    To my eye  everything seems to replicate what can be found on the Facebook Developers page but when i  like   Facebook is seemingly only picking up on the page title and general info   I have tried to  debug  the page using their Object debugger  and i get these warnings    Inferred Property   The og url property should be explicitly provided  even if a value can be inferred from other tags  Inferred Property   The og title property should be explicitly provided  even if a value can be inferred from other tags  Inferred Property   The og image property should be explicitly provided  even if a value can be inferred from other tags  Inferred Property   The og locale property should be explicitly provided  even if a value can be inferred from other tags    As far as i can tell  i have followed Facebook s instructions to the letter  but i have no joy  Can anyone point out if i m doing anything wrong   Thanks in advance  Dan

User · Answer

In my case an unexpected error notice in the source code stopped the facebook crawler from parsing the (correctly set) og-meta tags.

I was using the HTTP_ACCEPT_LANGUAGE header, which worked fine for regular browser requests but not for the crawler, as it obviously won't use/set it.

Therefore, it was crucial for me to use the facebook's debugger feature See exactly what our scraper sees for your URL, as the error notice only could only be seen there (but not through the regular 'view source code'-browser feature).

User · Answer

Are those tags on  http   www mywebaddress com     Bear in mind the linter will follow the og url tag as this tag should point to the canonical URL of the piece of content - so if you have a page  e g   http   mywebaddress com article1  with an og url tag pointing to  http   mywebaddress com   Facebook will go there and read the tags there also   Failing that  the most common reason i ve seen for seemingly correct tags not being detected by the linter is user-agent detection returning different content to Facebook s crawler than the content you re seeing when you manually check

User · Answer

In case it helps anyone I had the same error   It turns out my page had not been scrapped by Facebook in awhile and it was an old error   There was a scrape again button on the page that fixed it

User · Answer

It might help some people who are struggling to get Facebook to read Open Graph nicely      Have a look at the source code that is generated by browser using Firefox  Chrome or another desktop browser  many mobiles won t do view source  and make sure there is no blank lines before the doctype line or head tag    If there is Facebook will have a complete tantrum and throw it s toys out of the pram   Best description   Remove Blank Line - happy Facebook    took me about 1 5 - 2 hours to spot this

User · Answer

You need a space after the final set of quote marks   lt meta property  og url  content  http   www mywebaddress com   gt    Should be  likes this one   lt meta property  og url  content  http   www mywebaddress com    gt

User · Answer

UPD 2020   Open Graph Object Debugger  has been discontinued  Use Sharing Debugger to refresh Facebook cache     There is some confusion about tons of Facebook Tools and Documentation  So many people probably use the Sharing Debugger tool to check their OpenGraph markup  https   developers facebook com tools debug sharing   But it only retrieves the information about your site from the Facebook cache  This means that after you change the ogp-markup on your site  the Sharing Debugger will still be using the old cached data  Moreover  if there is no cached data on the Facebook server then the Sharing Debugger will show you the error  This URL hasn t been shared on Facebook before   So  the solution is to use another tool     Open Graph Object Debugger  https   developers facebook com tools debug og object   It allows you to Fetch new scrape information and refresh the Facebook cache         Honestly  I don t know how to find this tool exploring the Tools  amp  Support section of developers facebook com     I cannot find any links and mentions  I only have this tool in my bookmarks  That s Facebook       Use  property -attrs  I also noted that some developers use the name attribute instead of property  Many parsers probably will process such tags properly  but according to The Open Graph protocol  we should use property  not name    lt meta property  og url  content  http   www mywebaddress com   gt      Use full URLs  The last recommendation is to specify full URLs  For example  Facebook complains when you use relative URL in og image  So use the full one    lt meta property  og image  content  http   www mywebaddress com myimage jpg   gt

[facebook] Facebook Open Graph Error - Inferred Property

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