# Create or reuse a session

POST https://api.chaser.sh/v1/sessions
Content-Type: application/json

Create a browser or sandbox session. Workspace-backed requests reuse the live VM for that workspace when one already exists, otherwise they spawn a new one. Provide `workspace` (label or UUID) for persistent sessions. Set `ephemeral=true` to force a fresh non-persistent session without a workspace. Sandbox `image` is accepted only for ephemeral sessions; workspace-backed sessions inherit image from the workspace configuration.

Reference: https://docs.chaser.sh/api-reference/chaser-core-api/sessions/create-session

## OpenAPI Specification

```yaml
openapi: 3.1.0
info:
  title: Chaser Core API
  version: 1.0.0
paths:
  /v1/sessions:
    post:
      operationId: create-session
      summary: Create or reuse a session
      description: >-
        Create a browser or sandbox session. Workspace-backed requests reuse the
        live VM for that workspace when one already exists, otherwise they spawn
        a new one. Provide `workspace` (label or UUID) for persistent sessions.
        Set `ephemeral=true` to force a fresh non-persistent session without a
        workspace. Sandbox `image` is accepted only for ephemeral sessions;
        workspace-backed sessions inherit image from the workspace
        configuration.
      tags:
        - subpackage_sessions
      parameters:
        - name: Authorization
          in: header
          description: Bearer authentication
          required: true
          schema:
            type: string
      responses:
        '200':
          description: Session created
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SessionInfo'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                description: Any type
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/CreateSessionRequestDoc'
servers:
  - url: https://api.chaser.sh
  - url: http://localhost:8000
components:
  schemas:
    SessionType:
      type: string
      enum:
        - browser
        - sandbox
      title: SessionType
    CreateSessionPersistentRequestDoc:
      type: object
      properties:
        env:
          type: object
          additionalProperties:
            type: string
        github_repo:
          type:
            - string
            - 'null'
        proxy:
          type:
            - string
            - 'null'
        session_type:
          oneOf:
            - $ref: '#/components/schemas/SessionType'
            - type: 'null'
        workspace:
          type: string
      required:
        - workspace
      description: OpenAPI documentation schema for persistent session creation.
      title: CreateSessionPersistentRequestDoc
    CreateSessionEphemeralRequestDoc:
      type: object
      properties:
        env:
          type: object
          additionalProperties:
            type: string
        ephemeral:
          type: boolean
        github_repo:
          type:
            - string
            - 'null'
        image:
          type:
            - string
            - 'null'
        proxy:
          type:
            - string
            - 'null'
        session_type:
          oneOf:
            - $ref: '#/components/schemas/SessionType'
            - type: 'null'
      required:
        - ephemeral
      description: OpenAPI documentation schema for ephemeral session creation.
      title: CreateSessionEphemeralRequestDoc
    CreateSessionRequestDoc:
      oneOf:
        - $ref: '#/components/schemas/CreateSessionPersistentRequestDoc'
        - $ref: '#/components/schemas/CreateSessionEphemeralRequestDoc'
      description: OpenAPI documentation union for session creation.
      title: CreateSessionRequestDoc
    Endpoints:
      type: object
      properties:
        control:
          type: string
          description: Main control endpoint (CDP/HTTP)
        video:
          type:
            - string
            - 'null'
          description: Video stream endpoint
      required:
        - control
      title: Endpoints
    SessionInfo:
      type: object
      properties:
        active_connection_leases:
          type:
            - integer
            - 'null'
          description: >-
            Active connection leases reported by the owning daemon (if
            available).
        created_at:
          type: string
        endpoints:
          $ref: '#/components/schemas/Endpoints'
        id:
          type: string
        persistence:
          type:
            - boolean
            - 'null'
          description: >-
            Whether this session's workspace is configured to persist after
            termination.
        session_type:
          type: string
        status:
          type: string
        workspace_id:
          type:
            - string
            - 'null'
          description: Durable workspace identity.
      required:
        - created_at
        - endpoints
        - id
        - session_type
        - status
      title: SessionInfo
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer

```

## SDK Code Examples

```python
import requests

url = "https://api.chaser.sh/v1/sessions"

payload = {
    "proxy": "DEFAULT",
    "session_type": "sandbox",
    "workspace": "frontend-app"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.json())
```

```javascript
const url = 'https://api.chaser.sh/v1/sessions';
const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: '{"proxy":"DEFAULT","session_type":"sandbox","workspace":"frontend-app"}'
};

try {
  const response = await fetch(url, options);
  const data = await response.json();
  console.log(data);
} catch (error) {
  console.error(error);
}
```

```go
package main

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

func main() {

	url := "https://api.chaser.sh/v1/sessions"

	payload := strings.NewReader("{\n  \"proxy\": \"DEFAULT\",\n  \"session_type\": \"sandbox\",\n  \"workspace\": \"frontend-app\"\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(res)
	fmt.Println(string(body))

}
```

```ruby
require 'uri'
require 'net/http'

url = URI("https://api.chaser.sh/v1/sessions")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"proxy\": \"DEFAULT\",\n  \"session_type\": \"sandbox\",\n  \"workspace\": \"frontend-app\"\n}"

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

```java
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.Unirest;

HttpResponse<String> response = Unirest.post("https://api.chaser.sh/v1/sessions")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"proxy\": \"DEFAULT\",\n  \"session_type\": \"sandbox\",\n  \"workspace\": \"frontend-app\"\n}")
  .asString();
```

```php
<?php
require_once('vendor/autoload.php');

$client = new \GuzzleHttp\Client();

$response = $client->request('POST', 'https://api.chaser.sh/v1/sessions', [
  'body' => '{
  "proxy": "DEFAULT",
  "session_type": "sandbox",
  "workspace": "frontend-app"
}',
  'headers' => [
    'Authorization' => 'Bearer <token>',
    'Content-Type' => 'application/json',
  ],
]);

echo $response->getBody();
```

```csharp
using RestSharp;

var client = new RestClient("https://api.chaser.sh/v1/sessions");
var request = new RestRequest(Method.POST);
request.AddHeader("Authorization", "Bearer <token>");
request.AddHeader("Content-Type", "application/json");
request.AddParameter("application/json", "{\n  \"proxy\": \"DEFAULT\",\n  \"session_type\": \"sandbox\",\n  \"workspace\": \"frontend-app\"\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);
```

```swift
import Foundation

let headers = [
  "Authorization": "Bearer <token>",
  "Content-Type": "application/json"
]
let parameters = [
  "proxy": "DEFAULT",
  "session_type": "sandbox",
  "workspace": "frontend-app"
] as [String : Any]

let postData = JSONSerialization.data(withJSONObject: parameters, options: [])

let request = NSMutableURLRequest(url: NSURL(string: "https://api.chaser.sh/v1/sessions")! as URL,
                                        cachePolicy: .useProtocolCachePolicy,
                                    timeoutInterval: 10.0)
request.httpMethod = "POST"
request.allHTTPHeaderFields = headers
request.httpBody = postData as Data

let session = URLSession.shared
let dataTask = session.dataTask(with: request as URLRequest, completionHandler: { (data, response, error) -> Void in
  if (error != nil) {
    print(error as Any)
  } else {
    let httpResponse = response as? HTTPURLResponse
    print(httpResponse)
  }
})

dataTask.resume()
```