Request token retrieval failed:

RESPONSE:

Array
(
    [linkedin] => Array
        (
            [


__400:_Content_Length_Required
__ "content-type" content="text/html; charset=UTF-8">
  








  
Content Length Required

  
Could not process this request because Content-Length was not specified. Please double-check the URL (address) you used, or contact us if you feel you have reached this page in error.

  
Click the 
            [#8220;Back] => 
            [#8221;_button_on_your_browser_or_ "//www.linkedin.com/home">go to the home page.


  


  
Are you looking for any of these LinkedIn features?

  

  

  

  

            [nbsp;







] => 
        )

    [info] => Array
        (
            [url] => https://api.linkedin.com/uas/oauth/requestToken
            [content_type] => text/html
            [http_code] => 411
            [header_size] => 275
            [request_size] => 517
            [filetime] => -1
            [ssl_verify_result] => 0
            [redirect_count] => 0
            [total_time] => 0.663892
            [namelookup_time] => 0.06676
            [connect_time] => 0.214598
            [pretransfer_time] => 0.514118
            [size_upload] => 0
            [size_download] => 5569
            [speed_download] => 8388
            [speed_upload] => 0
            [download_content_length] => 5569
            [upload_content_length] => 0
            [starttransfer_time] => 0.663876
            [redirect_time] => 0
            [certinfo] => Array
                (
                )

            [primary_ip] => 2620:119:50e1:101::6cae:b24
            [primary_port] => 443
            [local_ip] => 2001:41d0:b:b1::1
            [local_port] => 48590
            [redirect_url] => 
        )

    [oauth] => Array
        (
            [header] => Authorization: OAuth realm="http%3A%2F%2Fapi.linkedin.com",oauth_version="1.0",oauth_nonce="834632c89576cebe543ce91819cd2324",oauth_timestamp="1614507602",oauth_consumer_key="77pkl93glwk229",oauth_callback="http%3A%2F%2Fwww.finroad.com%2F%3Faction%3Dsignin%26tab%3Dsignup%26validate%3Dsignup_linkedin_response",oauth_signature_method="HMAC-SHA1",oauth_signature="Z2SIP%2B3FmGotomAkGoNUXthN0oI%3D"
            [string] => POST&https%3A%2F%2Fapi.linkedin.com%2Fuas%2Foauth%2FrequestToken&oauth_callback%3Dhttp%253A%252F%252Fwww.finroad.com%252F%253Faction%253Dsignin%2526tab%253Dsignup%2526validate%253Dsignup_linkedin_response%26oauth_consumer_key%3D77pkl93glwk229%26oauth_nonce%3D834632c89576cebe543ce91819cd2324%26oauth_signature_method%3DHMAC-SHA1%26oauth_timestamp%3D1614507602%26oauth_version%3D1.0
        )

    [error] => OAuth callback URL was not confirmed by the LinkedIn end-point
    [success] => 
)


LINKEDIN OBJ:

LinkedIn Object
(
    [callback:protected] => http://www.finroad.com/?action=signin&tab=signup&validate=signup_linkedin_response
    [token:protected] => 
    [application_key:protected] => 77pkl93glwk229
    [application_secret:protected] => UaQMs3Csqi6zfXLi
    [response_format:protected] => xml
    [last_request_headers] => Array
        (
            [0] => Authorization: OAuth realm="http%3A%2F%2Fapi.linkedin.com",oauth_version="1.0",oauth_nonce="834632c89576cebe543ce91819cd2324",oauth_timestamp="1614507602",oauth_consumer_key="77pkl93glwk229",oauth_callback="http%3A%2F%2Fwww.finroad.com%2F%3Faction%3Dsignin%26tab%3Dsignup%26validate%3Dsignup_linkedin_response",oauth_signature_method="HMAC-SHA1",oauth_signature="Z2SIP%2B3FmGotomAkGoNUXthN0oI%3D"
            [1] => Content-Type: text/plain; charset=UTF-8
        )

    [last_request_url] => https://api.linkedin.com/uas/oauth/requestToken
)