Hi. I am trying to upload an image to Backendless. This is my request:
POST /v1/files/imagenes/empresas/ficheroPrueba.png
HTTP/1.1
Host: api.backendless.com
Content-Length: 6140
User-Agent: Guzzle/3.8.0 curl/7.28.1 PHP/5.4.10
application-id: DAB27423-6286-8991-FF7E-81685EF9A400
secret-key: 1651B9BE-87AC-6D9A-FFC7-229498BC1F00
application-type: REST
Content-Type: multipart/form-data
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
And this is the error i am getting:
Client error response [status code] 400
[reason phrase] Bad Request [url] https://api.backendless.com/v1/files/imagenes/empresas/ficheroPrueba.png
According to documentation, my request is ok, but i have no idea why i am getting a bad request. Am i missing something in the request?