[wp-trac] [WordPress Trac] #51146: After upgrade to WordPress 5.5 I got an error on using REST api

[WordPress Trac]

#51146: After upgrade to WordPress 5.5  I got an error on using REST api
--------------------------+-----------------------------
 Reporter:  rtagliento    |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  REST API      |    Version:  5.5
 Severity:  normal        |   Keywords:
  Focuses:  rest-api      |
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 Hi, I updated WordPress to 5.5 and CiviCRM to 5.28.3 and I am getting a
 new strange error on rest API.


 If I pass this url parameter  --->  **&json={"sequential":1}**

 [https://www.yogapause.it/civicenter/wp-
 json/civicrm/v3/rest?entity=Contact&action=get&api_key=R3BrdHBic1dYUENlR3Vhc092dHBy&key=6d8984d9bc0f9c2c7121db065e094e51&json={%22sequential%22:1}]


 I got this error:
 **{"code":"rest_invalid_param","message":"Parametro(i) non valido(i):
 json","data":{"status":400,"params":{"json":"json non \u00e8 del tipo
 integer."}}}**

 in english must be somthing like
 **{"code":"rest_invalid_param","message":"Parameter(i) not valid(i):
 json","data":{"status":400,"params":{"json":"json is not an integer
 type."}}}**


 Using the parameter json=1 it works, but I use the JSON that isn't an
 integer :(


 May you check what's going on?

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Ticket URL: <https://core.trac.wordpress.org/ticket/51146>
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