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A URL in an API is the address an HTTP client uses to locate a resource or operation. It usually contains a scheme, host, path, and sometimes query parameters. The URL is only part of the request: the HTTP method, headers, optional body, authentication, and expected response also matter.
What an API URL does
When software calls an HTTP API, it sends a request to a network address. The URL tells the client where to direct that request and often identifies the resource or operation the server should handle. For example, in GET https://api.example.com/users/42?expand=orders, the URL is https://api.example.com/users/42?expand=orders; GET is the method.
The distinction matters because a URL alone does not fully describe what a server will do. A request combines its target with an HTTP method and other request details. The API’s contract explains how the server interprets that combination and what response it returns.
What the parts of an API URL mean
A generic URI can be represented as scheme://authority/path?query#fragment. The query and fragment are optional. In everyday API work, the scheme is commonly https, and the authority identifies the server.
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| Part | Example | Purpose |
|---|---|---|
| Scheme | https |
Identifies the access scheme the client uses. |
| Authority | api.example.com |
Names the host; an optional port can follow it, such as :8443. |
| Path | /users/42 |
Identifies a resource or route within the API. |
| Query | ?expand=orders |
Adds parameters, often for filtering, pagination, or representation options. |
| Fragment | #section |
A URI component that may be meaningful to a client; it is not normally part of the HTTP request sent to the server. |
In the example, https is the scheme, api.example.com is the host within the authority, /users/42 is the path, and expand=orders is the query. The path and query are not interchangeable by definition: API documentation specifies what each segment and parameter means.
URL, URI, endpoint: what is the difference?
URI
A URI, or Uniform Resource Identifier, is a string that identifies a resource. RFC 3986 describes a URI as providing “a simple and extensible means for identifying a resource.” It defines a URL as a subset of URIs that identifies a resource and provides a way to locate it.
URL
A URL, or Uniform Resource Locator, is the familiar web address. MDN calls it “the web address” and notes that it is the most common type of URI. In API conversations, “URL” usually means the address string used as the HTTP request target.
Endpoint
An endpoint is the callable interface described by an API contract, commonly identified by a URL together with a method and the rules for its inputs and outputs. For instance, the same path may accept GET to retrieve a record and DELETE to remove it, if the API supports both. Saying only “the endpoint is /users/42” may therefore leave out important details.
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How paths and query parameters are used
Path: identify the route or resource
Paths often express a hierarchy, such as /users/42/orders: a collection of orders associated with a user. A variable segment such as 42 is commonly called a path parameter. The API documentation determines whether it represents an ID, slug, or another value. Do not assume that changing a path segment is valid just because the resulting URL is syntactically well-formed.
Query: provide additional inputs
A query begins with ? and commonly contains name-value pairs, such as ?page=2&limit=20. APIs may use query parameters to filter results, choose fields, sort data, paginate, or request an alternate representation. The server’s documentation defines accepted names, value formats, defaults, and whether a parameter is optional.
Do not put credentials or sensitive data in a URL unless the API specifically requires it and the security implications are understood. URLs can be copied into logs, browser history, monitoring tools, or intermediary systems. Authentication is commonly specified using a documented header or another supported mechanism.
The URL is not the whole API request
Before calling an endpoint, confirm the complete request contract. At minimum, check:
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GETorPOST, as documented for the operation. - Parameters: which values belong in the path, query, or request body, plus required formats and encoding.
- Headers: for example, content negotiation or a documented authentication header.
- Body: whether one is required and which media type and schema it must follow.
- Response: expected status codes, response format, and possible error responses.
A valid-looking URL can still produce an error if the method is unsupported, credentials are missing, a required parameter is absent, or the body does not match the documented format. Conversely, two requests to the same URL can mean different things when their methods or other request fields differ.
Can you use a relative URL for an API request?
Yes, when the client has a base URL against which to resolve it. A relative reference such as /users/42 does not specify a scheme or host by itself; a client or application environment must supply the base. URL libraries can parse and construct URLs, encode components, and resolve a relative URL when given a base.
For example, a browser application configured with https://api.example.com could resolve /users/42 to https://api.example.com/users/42. A server-side script needs the same information explicitly or through its configuration. Do not assume a relative API URL will resolve against the API host: in a browser it may resolve against the page’s origin instead.
Construct and inspect URLs safely
Prefer a URL library over manual string concatenation when values may contain spaces, ampersands, slashes, or other reserved characters. Concatenating a query value containing &, for example, can accidentally create another parameter. Build or encode the relevant URL component using the library for your language, then inspect the final URL and compare it with the API’s documented format.
For a browser-side JavaScript example, new URL() can resolve a relative path against a base, while searchParams.set() adds or replaces a query parameter:
const endpoint = new URL('/users/42', 'https://api.example.com');
endpoint.searchParams.set('expand', 'orders');
console.log(endpoint.href);
This constructs https://api.example.com/users/42?expand=orders. It does not send a request or prove that the server supports that route; those depend on the API contract.
Example: a screenshot API URL
A concrete API URL makes the pieces easier to see. ScreenshotNeo’s API base is https://api.screenshotneo.com/v1/shot. Its documented one-call pattern is a GET request with an access key and target page URL. Here, access_key and url are query parameters; the screenshot service’s API contract determines the response. See the ScreenshotNeo API documentation for the request details.
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cURL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp
Python:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://stripe.com"}, timeout=90)
open("shot.webp", "wb").write(r.content)
Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://stripe.com' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
Replace YOUR_API_KEY with your key. The cURL command saves the response as shot.webp; the Python snippet writes the response body to the same filename. The Node.js example sends the request and exposes the response as res; add application-specific handling if you need to save or inspect its body. These examples illustrate URL structure and request construction, not a claim that every API uses the same parameters or response format.
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- The host cannot be reached: check for a misspelled host, the wrong environment, or an incorrect scheme. Use the API’s documented base URL.
- The route returns not found: compare path segments, capitalization, and version prefix with the docs. A correct host does not guarantee that a particular path exists.
- A query value is read incorrectly: encode values with a URL library, especially when they contain reserved characters. Check that each parameter name and value matches the contract.
- The server rejects the request method: use the method documented for that endpoint; the URL alone does not specify the operation.
- The server reports missing credentials or parameters: verify where the API expects each item—path, query, header, or body—and ensure names are exact.
- A browser request fails while a command-line call works: the browser and server-side client have different request contexts and restrictions. Check the API’s browser-access and cross-origin requirements rather than changing the URL at random.
- A relative path reaches the wrong host: resolve it against the intended API base explicitly and inspect the completed URL before making the request.
Or skip the browser setup
If your API task is to capture a webpage, ScreenshotNeo offers a one-request alternative to configuring a browser capture flow. For example: curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://stripe.com -o shot.webp. The API docs describe the request.
ScreenshotNeo removes cookie banners, newsletter popups, and chat widgets before capture. Bot checks, blank pages, and failed loads are not billed. Its MCP server lets AI agents take screenshots. The free plan includes 1,000 screenshots a month with no card; paid plans start at $5 for 3,000. Sign up for ScreenshotNeo’s free plan.
Frequently Asked Questions
Is every API URL a web page I can open in a browser?
No. A URL may identify an API route that expects a particular method, authentication, headers, or request body rather than returning a human-readable page.
Does a syntactically valid URL mean the API call will succeed?
No. Syntax only describes a well-formed address; the route, method, parameters, authorization, and request format must also be accepted by that API.
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