HTTP request & response testing.

Decode standard or URL-safe base64 directly from a URL. The decoded bytes are the response body.

curl https://httpresponder.com/base64/SGVsbG8sIHdvcmxkIQ==

Encode UTF-8 text with mode=encode, or POST a JSON object with data and mode. Set content_type for a binary decoded response.

curl -X POST https://httpresponder.com/base64 \
  -H 'content-type: application/json' \
  -d '{"data":"Hello, world!","mode":"encode"}'

Choose the status, body, content_type and response headers. Use base64 for binary response bodies. Works with GET or POST.

curl 'https://httpresponder.com/respond?status=201&body=Created'

Combine status (s), headers (h), cookies (c), redirects (r) and a base64 body (b64) in one path.

curl 'https://httpresponder.com/mix/s=201/h=content-type:text%2Fplain/b64=SGVsbG8='

Return the query parameters as response headers.

Echo the request method, URL, headers, query arguments and body. JSON, URL-encoded forms and multipart uploads are parsed.

curl -X POST https://httpresponder.com/anything -d 'hello=world'

Method-specific request echo endpoints. Use the matching HTTP method.

Return incoming request headers as JSON.

Return the request body unchanged, with its original content type.

Inspect the client IP or User-Agent header.

Return an HTTP status from 200 to 599. A comma-separated list, such as 200,503, chooses a response at random.

Redirect to the url query parameter. Set status_code to 301, 302, 303, 307 or 308.

Follow a chain of redirects before reaching /get. /relative-redirect and /absolute-redirect choose the Location format.

Require matching HTTP Basic credentials. Missing or incorrect credentials return 401.

Test Bearer authentication. Omit the expected token to accept any non-empty bearer token.

Read request cookies. /cookies/set?name=value sets cookies; /cookies/delete?name= removes them.

Wait before responding with the request echo. Fractional seconds are supported, up to 10 seconds.

Stream newline-delimited JSON records.

Stream server-sent events. Control count and duration with query parameters.

Send bytes over time. Configure numbytes, duration, delay and code; total duration is limited to 10 seconds.

Return random binary data, up to 1 MiB.

Generate a random UUID.

Fetch a small document in the specified content type.

Return a compressed request echo.

Test If-Match and If-None-Match handling. /cache/{seconds} sets Cache-Control.