---
title: >-
  Deprecation of POST requests without a Content-Length or Transfer-Encoding:
  chunked header - Shopify developer changelog
description: >-
  Shopify’s developer changelog documents all changes to Shopify’s platform.
  Find the latest news and learn about new platform opportunities.
source_url:
  html: >-
    https://shopify.dev/changelog/posts/deprecation-of-post-requests-without-a-content-length-or-transfer-encoding-chunked-header
  md: >-
    https://shopify.dev/changelog/posts/deprecation-of-post-requests-without-a-content-length-or-transfer-encoding-chunked-header.md
metadata:
  effectiveApiVersion: ''
  affectedApi:
    - displayName: Admin GraphQL API
      handle: admin-graphql
    - displayName: Admin REST API
      handle: admin-rest
    - displayName: Customer Account API
      handle: customer-account-graphql
    - displayName: Payments Apps API
      handle: payments-apps-api
    - displayName: Storefront API
      handle: storefront-graphql
    - displayName: Events & webhooks
      handle: webhook
  primaryTag:
    displayName: API
    handle: api
  secondaryTag:
    displayName: Deprecation announcement
    handle: deprecation-announcement
  indicatesActionRequired: true
  createdAt: '2025-06-27T16:58:11-04:00'
  postedAt: '2025-06-28T12:00:00-04:00'
  updatedAt: '2025-06-27T17:08:13-04:00'
  effectiveAt: '2025-06-28T12:00:00-04:00'
---

June 28, 2025

# Deprecation of POST requests without a Content-Length or Transfer-Encoding: chunked header

DateJune 28, 2025

Flags[Deprecation announcement](https://shopify.dev/changelog?filter=deprecation-announcement)[Action required](https://shopify.dev/changelog?action_required=true)

SurfacesAPI

Affected APIs[Admin GraphQL API](https://shopify.dev/changelog?api_type=admin-graphql)[Admin REST API](https://shopify.dev/changelog?api_type=admin-rest)[Customer Account API](https://shopify.dev/changelog?api_type=customer-account-graphql)[Payments Apps API](https://shopify.dev/changelog?api_type=payments-apps-api)[Storefront API](https://shopify.dev/changelog?api_type=storefront-graphql)[Events & webhooks](https://shopify.dev/changelog?api_type=webhook)

We're making changes to our HTTP/1.0 and HTTP/1.1 request handling to improve security and compliance with web standards. Starting August 1, 2025, all POST requests to Shopify APIs must include either a Content-Length header or Transfer-Encoding: chunked header, or they'll return an HTTP 411 error.

**What you need to do**

Update your client libraries and API integrations to ensure all POST requests include one of these headers:

* `Content-Length`: Specifies the exact size of the request body in bytes
* `Transfer-Encoding: chunked`: Indicates the request body is sent in chunks

Most modern HTTP client libraries automatically include these headers, but some custom implementations or older libraries might not.

**Why we're making this change**

This change aligns with HTTP/1.1 standards (RFC 7230) and helps prevent potential security vulnerabilities related to request smuggling attacks. It ensures consistent request handling across our infrastructure.