HEAD Method in REST API Explained with Examples

Most developers are familiar with GET, POST, PUT, PATCH, and DELETE requests. The HEAD method receives far less attention, yet it solves several practical problems involving caching, monitoring, and metadata retrieval.

Instead of downloading an entire resource, the HEAD method allows you to retrieve only the response headers. This makes it useful when you need information about a resource without transferring the actual content.

In this guide, you'll learn how the HEAD method in REST API works, when to use it, how it differs from the GET method in REST API, and the real-world scenarios where it can improve performance.

What Is the HEAD Method in REST API?

The HEAD method in REST API is an HTTP request method defined by the HTTP Semantics specification. It behaves almost exactly like a GET request, with one important difference: the server returns only the response headers and does not include a response body.

Like other HTTP methods in REST API, the HEAD method helps clients interact with resources efficiently. Since no response body is transferred, HEAD requests consume less bandwidth and complete faster than equivalent GET requests.

How the HEAD Method Works in REST APIs

When a client sends a HEAD request, the server processes the request in the same way it would process a GET request.

The difference is that the server sends only the response headers and omits the resource representation from the response body.

A HEAD response commonly includes metadata such as:

Content-Type – Indicates the format of the resource.
Content-Length – Shows the size of the resource in bytes.
Last-Modified – Indicates when the resource was last updated.
ETag – Provides a unique identifier for a specific version of the resource.
Cache-Control – Defines caching behavior.
Expires – Specifies when cached content becomes stale.

To better understand these headers, see this guide on REST API response headers.

If you've ever needed to know whether a large file changed before downloading it again, the HEAD method is designed for exactly that type of scenario.

Example of a HEAD Request

HEAD /api/users/12345 HTTP/1.1
Host: api.example.com

Example response:

HTTP/1.1 200 OK
Content-Type: application/json
Content-Length: 842
Last-Modified: Wed, 10 Jun 2026 15:30:00 GMT
ETag: "abc123xyz"

Notice that the response contains headers but no response body.

If you are new to request processing, it helps to understand how a REST API request and response pair works before exploring HEAD requests in detail.

HEAD vs GET Method in REST API

The HEAD and GET methods are closely related.

A GET request returns both headers and the response body.

A HEAD request returns only the headers.

Use GET when you need the actual resource data.

Use HEAD when you only need metadata about the resource.

Common situations where HEAD is a better choice include:

Checking whether a resource exists.
Determining file size before downloading.
Validating cached content.
Monitoring API availability.
Retrieving metadata without transferring large payloads.

Common Use Cases of the HEAD Method in REST APIs

1. Check Resource Availability

One of the most common uses of the HEAD method is verifying whether a resource exists.

Instead of downloading the entire resource, a client can send a HEAD request and inspect the returned status code.

For example:

200 OK indicates the resource exists.
404 Not Found indicates the resource does not exist.
403 Forbidden indicates access is restricted.

This approach is frequently used by monitoring systems and automated tools.

2. Validate Cached Content

Caching systems often use HEAD requests together with headers such as If-Modified-Since and If-None-Match.

The server can determine whether the cached copy is still valid without transferring the full resource again.

If the resource has not changed, the server may return:

304 Not Modified

This reduces bandwidth usage and improves response times.

3. Retrieve Metadata Without Downloading Content

Sometimes an application only needs metadata.

For example, a client may need:

File size
Content type
Last modification date
Cache information

A HEAD request provides all of this information without downloading the actual resource.

4. Check File Size Before Downloading

Suppose an API provides backup files, log archives, videos, or software packages.

Before downloading several gigabytes of data, a client can send a HEAD request and inspect the Content-Length header to determine the file size.

This approach is commonly used in download managers and cloud storage systems.

5. API Monitoring and Health Checks

Many monitoring platforms use HEAD requests instead of GET requests because they only need to verify that a resource is available.

Since no response body is returned, HEAD requests reduce network traffic while still providing:

HTTP status codes
Response headers
Availability information

This makes the HEAD method useful for DevOps engineers, SREs, and platform teams managing large-scale systems.

Pro Tip: HEAD Requests and CDNs

Content delivery networks (CDNs), caching proxies, and large-scale web applications frequently use HEAD requests to validate cached content.

By checking values such as:

ETag
Last-Modified
Cache-Control

they can determine whether content has changed without downloading the resource again.

This reduces server load and improves overall application performance.

HEAD Method Response Status Codes

The HEAD method can return the same HTTP status codes as a GET request.

Some common examples include:

200 OK – Request succeeded.
301 Moved Permanently – Resource was moved.
304 Not Modified – Cached content is still valid.
400 Bad Request – Invalid request syntax.
401 Unauthorized – Authentication required.
403 Forbidden – Access denied.
404 Not Found – Resource not found.
500 Internal Server Error – Server-side failure.

You can learn more about status codes in the guide on HTTP status messages in REST API.

Is the HEAD Method Safe and Idempotent?

Yes.

According to the HTTP specification, the HEAD method is both safe and idempotent.

Safe

A safe method does not modify the resource on the server.

Multiple HEAD requests should not create, update, or delete data.

Idempotent

An idempotent method produces the same outcome regardless of how many times it is executed.

Sending the same HEAD request multiple times should have the same effect as sending it once.

This characteristic makes the HEAD method suitable for automated monitoring, validation, and caching operations.

How HEAD Fits Into REST Architecture

REST APIs rely on standard HTTP methods to perform operations on resources.

The HEAD method complements other methods such as:

Understanding how REST builds on HTTP standards helps clarify why HEAD exists and where it fits within the architecture. You can learn more in this guide about how REST API uses HTTP.

FAQs About HEAD Method in REST API

Is the HEAD method faster than GET?

In many cases, yes.

Because the server does not return a response body, less data is transferred over the network.

This often results in lower bandwidth consumption and faster responses.

Can a HEAD request return a response body?

According to the HTTP specification, a HEAD response should not include a response body.

However, some poorly implemented servers may incorrectly return one.

Applications should be prepared to handle such cases gracefully.

Can HEAD requests be authenticated?

Yes.

HEAD requests can include authentication headers such as:

Authorization: Bearer <token>

Authentication works the same way as it does with GET requests.

For more information, see REST API authorization and authentication.

When should I use HEAD instead of GET?

Use the HEAD method when you need:

Resource availability checks
Metadata retrieval
Cache validation
File size information
Monitoring and health checks

Use GET when you need the actual resource content.

Is the HEAD method required in REST APIs?

The HTTP specification defines the HEAD method, but not every API implements it correctly.

Before relying on HEAD requests in production, verify support in the API documentation and test the endpoint behavior.

Final Thoughts

The HEAD method in REST API is a lightweight alternative to GET when you only need metadata about a resource.

It is especially useful for cache validation, monitoring, resource discovery, and file size checks.

Although it is often overlooked, understanding the HEAD method can help developers build more efficient applications and reduce unnecessary network traffic.