Get the files of a saved step

Returns a download URL for each file a completed step saved. Available when the model saves step results (it turns them on in its reactor.yaml with runtime.step_results). The endpoint keeps working after the session ends.

files lists every file the step’s result.json names, then result.json itself. A failed step has a result.json with an error and no other files. Fetch each url before expires_at and treat it as opaque; call again for fresh URLs.

A step’s files are uploaded after the model produces them, and often after the session closes, so a closed session can still answer 202. A step that has not arrived 10 minutes after the session closed will not arrive, and answers 404. A session whose start was refused ran no step, so it answers 404 as soon as it is closed.

Callable by a developer of the account that ran the session or of the account that owns the model. A session token reads only the sessions bound to it.

GET

sessions

{session_id}

steps

{step}

Get the files of a saved step

curl --request GET \
  --url https://api.reactor.inc/sessions/{session_id}/steps/{step} \
  --header 'Authorization: Bearer <token>'

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.reactor.inc/sessions/{session_id}/steps/{step}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.reactor.inc/sessions/{session_id}/steps/{step}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://api.reactor.inc/sessions/{session_id}/steps/{step}"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://api.reactor.inc/sessions/{session_id}/steps/{step}")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

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

{
  "step": 1,
  "files": [
    {
      "name": "output.mp4",
      "content_type": "video/mp4",
      "url": "https://storage.example.com/steps/output.mp4?signature=abc"
    },
    {
      "name": "result.json",
      "content_type": "application/json",
      "url": "https://storage.example.com/steps/result.json?signature=def"
    }
  ],
  "expires_at": "2026-10-04T18:15:00Z"
}

{
  "status": "pending"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

Authorizations

Authorization

string

header

required

A Reactor API key (rk_...), sent as Authorization: Bearer rk_.... Keep it on a server.

Headers

Reactor-API-Version

string

The API protocol version the client speaks. Currently 1. Older versions than the server's minimum get 426.

Example:

"1"

Path Parameters

session_id

string<uuid>

required

The session's ID, as returned by POST /sessions.

step

integer<int32>

required

The step number. Steps count from 1 in each session.

Required range: 1 <= x <= 2147483647

Example:

1

Response

The step is complete.

step

integer

required

files

object[]

required

Show child attributes

expires_at

string<date-time>

required

When the download URLs stop working.

⌘I

Get the files of a saved step

curl --request GET \
  --url https://api.reactor.inc/sessions/{session_id}/steps/{step} \
  --header 'Authorization: Bearer <token>'

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://api.reactor.inc/sessions/{session_id}/steps/{step}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.reactor.inc/sessions/{session_id}/steps/{step}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://api.reactor.inc/sessions/{session_id}/steps/{step}"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

require 'uri'
require 'net/http'

url = URI("https://api.reactor.inc/sessions/{session_id}/steps/{step}")

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

request = Net::HTTP::Get.new(url)
request["Authorization"] = 'Bearer <token>'

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

{
  "step": 1,
  "files": [
    {
      "name": "output.mp4",
      "content_type": "video/mp4",
      "url": "https://storage.example.com/steps/output.mp4?signature=abc"
    },
    {
      "name": "result.json",
      "content_type": "application/json",
      "url": "https://storage.example.com/steps/result.json?signature=def"
    }
  ],
  "expires_at": "2026-10-04T18:15:00Z"
}

{
  "status": "pending"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

{
  "error": "<string>",
  "message": "<string>",
  "resource": "<string>",
  "reason": "<string>"
}

Get started

SDK Reference

CLI Reference

Platform API Reference

Endpoints

Get the files of a saved step

Authorizations

Headers

Path Parameters

Response