Download a verifiable byte pattern that supports HTTP Range requests

GETHEADhttps://api.testingapis.com/api/files/range/{n}Sign in to see this endpoint's URL

The byte at offset i is i % 256, so any slice can be checked. Single ranges such as bytes=0-99, bytes=500- and bytes=-10 return 206; unsatisfiable ranges return 416, and multiple ranges are ignored (full 200). A fixed ETag and Last-Modified make If-None-Match, If-Modified-Since and If-Range work. HEAD returns headers only.

Parameters 2

Name	Type	Description
`n`required	path · integer (int32)	Total size in bytes, 1–10485760 (10 MB).
`Range`	header · string	Byte range, e.g. bytes=0-99. Returns 206, or 416 when unsatisfiable.

Responses

200: The full body.
206: The requested range.
304: Not modified (a conditional request matched).
400: n is outside 1–10485760.
416: The range is not satisfiable.

Example

Request

curl -X GET "https://api.testingapis.com/api/files/range/100" \
  -H "Range: bytes=0-9" \
  -H "X-TestingApis-Key: YOUR_API_KEY"

Response206 Partial Content

Content-Type: application/octet-stream
ETag: "range-100"
Last-Modified: Tue, 01 Jul 2025 00:00:00 GMT
Content-Range: bytes 0-9/100

<binary body: 10 bytes, application/octet-stream>

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api.testingapis.com

curl 'https://api.testingapis.com/api/files/range/100' \
  -H 'Range: bytes=0-9' \
  -H 'X-TestingApis-Key: YOUR_API_KEY'

const res = await fetch("https://api.testingapis.com/api/files/range/100", {
  headers: {
    "Range": "bytes=0-9",
    "X-TestingApis-Key": "YOUR_API_KEY",
  },
});
console.log(res.status, await res.text());

const res = await fetch("https://api.testingapis.com/api/files/range/100", {
  headers: {
    "Range": "bytes=0-9",
    "X-TestingApis-Key": "YOUR_API_KEY",
  },
});
const body: string = await res.text();
console.log(res.status, body);

import requests

res = requests.get(
    "https://api.testingapis.com/api/files/range/100",
    headers={
        "Range": "bytes=0-9",
        "X-TestingApis-Key": "YOUR_API_KEY",
    },
)
print(res.status_code, res.text)

using var client = new HttpClient();
using var request = new HttpRequestMessage(HttpMethod.Get, "https://api.testingapis.com/api/files/range/100");
request.Headers.TryAddWithoutValidation("Range", "bytes=0-9");
request.Headers.TryAddWithoutValidation("X-TestingApis-Key", "YOUR_API_KEY");
using var response = await client.SendAsync(request);
Console.WriteLine($"{(int)response.StatusCode} {await response.Content.ReadAsStringAsync()}");

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder(URI.create("https://api.testingapis.com/api/files/range/100"))
                .header("Range", "bytes=0-9")
                .header("X-TestingApis-Key", "YOUR_API_KEY")
                .GET()
                .build();
        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        System.out.println(response.statusCode() + " " + response.body());
    }
}

package main

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

func main() {
	req, err := http.NewRequest("GET", "https://api.testingapis.com/api/files/range/100", nil)
	if err != nil {
		panic(err)
	}
	req.Header.Set("Range", "bytes=0-9")
	req.Header.Set("X-TestingApis-Key", "YOUR_API_KEY")
	res, err := http.DefaultClient.Do(req)
	if err != nil {
		panic(err)
	}
	defer res.Body.Close()
	data, err := io.ReadAll(res.Body)
	if err != nil {
		panic(err)
	}
	fmt.Println(res.StatusCode, string(data))
}

https://api.testingapis.com/api/files/range/100

Path

nrequiredinteger (int32)

Query

Headers

Rangestring