curl --request POST \
  --url http://localhost:4310/v1/orgs/{orgId}/databases/{databaseId}/tables/{tableId}/schema/preview \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "expectedSchemaVersion": 1,
  "change": {
    "kind": "add_field",
    "field": {}
  }
}
'

import requests

url = "http://localhost:4310/v1/orgs/{orgId}/databases/{databaseId}/tables/{tableId}/schema/preview"

payload = {
    "expectedSchemaVersion": 1,
    "change": {
        "kind": "add_field",
        "field": {}
    }
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({expectedSchemaVersion: 1, change: {kind: 'add_field', field: {}}})
};

fetch('http://localhost:4310/v1/orgs/{orgId}/databases/{databaseId}/tables/{tableId}/schema/preview', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_PORT => "4310",
  CURLOPT_URL => "http://localhost:4310/v1/orgs/{orgId}/databases/{databaseId}/tables/{tableId}/schema/preview",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'expectedSchemaVersion' => 1,
    'change' => [
        'kind' => 'add_field',
        'field' => [
                
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "http://localhost:4310/v1/orgs/{orgId}/databases/{databaseId}/tables/{tableId}/schema/preview"

	payload := strings.NewReader("{\n  \"expectedSchemaVersion\": 1,\n  \"change\": {\n    \"kind\": \"add_field\",\n    \"field\": {}\n  }\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("http://localhost:4310/v1/orgs/{orgId}/databases/{databaseId}/tables/{tableId}/schema/preview")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"expectedSchemaVersion\": 1,\n  \"change\": {\n    \"kind\": \"add_field\",\n    \"field\": {}\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("http://localhost:4310/v1/orgs/{orgId}/databases/{databaseId}/tables/{tableId}/schema/preview")

http = Net::HTTP.new(url.host, url.port)

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"expectedSchemaVersion\": 1,\n  \"change\": {\n    \"kind\": \"add_field\",\n    \"field\": {}\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "valid": true,
  "requiresJob": true,
  "rowCount": 4503599627370495,
  "conflicts": [
    {
      "rowId": "<string>",
      "code": "<string>",
      "message": "<string>",
      "fieldId": "<string>"
    }
  ],
  "reportArtifactId": "<string>"
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "requestId": "<string>",
    "details": "<unknown>"
  }
}