JeanMarc,

Am using the https://api.einstein.ai/v2/language/intent and am getting a failed to connect to Port 80 exception while trying to POST from cURL. 

Below is the API call -

Http h = new Http();
    
     // Instantiate a new HTTP request
    HttpRequest req = new HttpRequest();
   
    req.setMethod('POST');
    // Send the request, and return a response
    String contentBoundary =  HttpFormBuilder.WriteBoundary();
 
    String modelId = ''; //insert your model Id
    String sampleId= 'test';
 
  
  req.setEndpoint('https://api.einstein.ai/v2/language/intent');

    
     
   String content = 'how is my package being shipped?';
   String contentType = '';//'\nContent-Type: text/plain\nContent-Transfer-Encoding: gzip';
   String token = 'Insert the token here';
// assemble the body payload
    String headerValue = '----' + contentBoundary  + contentType+ '\nContent-Disposition: form-data; name="modelId";\n\n'  + modelId + '\n';
    String body =  '----' + contentBoundary +contentType+ '\nContent-Disposition: form-data; name="document";\n\n'  + content  + '\n';
    String bodySample = '----' + contentBoundary + '\nContent-Disposition: form-data; name="sampleId";\n\n'  + 'Test'  + '\n';
    String footer ='----'+ contentBoundary + '--' ;
    String bodyPayload = headerValue + body + footer; 


     String authorizationHeader = 'Bearer ' + token;
     //EncodingUtil.base64Encode(headerValue);
     req.setHeader('Content-Type', 'multipart/form-data; boundary=' + '--'+ contentBoundary);
     req.setHeader('Authorization', authorizationHeader);
     req.setHeader('Cache-Control', 'no-cache');
    //if the request and response for your REST call is JSON, use the code below.
     req.setHeader('accept', '*/*');
     req.setHeader('Compressed', 'true');
    // system.debug('the body of the request is '+bodyPayLoad);
     
     //req.setHeader('Accept', '*/*');
    req.setBody(bodyPayload);
    system.debug('request is'+req.getBody());
    HttpResponse res = h.send(req);
    system.debug('the response is '+ res.getBody());