From 6996ad504aa5bc5a88d7757be3a7d389801e870d Mon Sep 17 00:00:00 2001
From: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Date: Fri, 17 Oct 2025 19:13:49 +0000
Subject: [PATCH] docs: document default Content-Type header for fetch and
 webhook steps

- Add section explaining default Content-Type: application/json header
- Document that users can override the default header
- Clarify that no header is added for GET requests or empty bodies
- Apply documentation to both fetch function and webhook channel pages

Co-Authored-By: Chris Bell <cjbell1988@gmail.com>
---
 content/designing-workflows/fetch-function.mdx | 8 ++++++++
 content/integrations/webhook/overview.mdx      | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/content/designing-workflows/fetch-function.mdx b/content/designing-workflows/fetch-function.mdx
index 770640c95..738b30f27 100644
--- a/content/designing-workflows/fetch-function.mdx
+++ b/content/designing-workflows/fetch-function.mdx
@@ -36,6 +36,14 @@ Aside from the request method selector, each of the above fields is a Liquid-com
 
 See the [Knock template editor reference](/send-notifications/designing-workflows/template-editor) for detailed information on working with Liquid templates in Knock.
 
+### Default headers
+
+When a fetch function includes a request body, Knock automatically adds a `Content-Type: application/json` header to the request. This ensures your endpoint receives properly formatted JSON data with the correct content type.
+
+You can override this default by explicitly setting your own `Content-Type` header in the headers field. This allows you to use alternative content types (such as `application/xml` or `text/plain`) when needed for your specific use case.
+
+For `GET` requests or requests without a body, no default `Content-Type` header is added.
+
 ## Request execution
 
 When executing the request for a fetch function, Knock expects the following from your service:
diff --git a/content/integrations/webhook/overview.mdx b/content/integrations/webhook/overview.mdx
index 92808c5e5..111f9b702 100644
--- a/content/integrations/webhook/overview.mdx
+++ b/content/integrations/webhook/overview.mdx
@@ -69,6 +69,14 @@ To learn how to build a webhook request in detail, you can read [our fetch funct
   }
 />
 
+### Default headers
+
+When a webhook request includes a request body, Knock automatically adds a `Content-Type: application/json` header to the request. This ensures your endpoint receives properly formatted JSON data with the correct content type.
+
+You can override this default by explicitly setting your own `Content-Type` header in the headers field. This allows you to use alternative content types when needed for your specific use case.
+
+For `GET` requests or requests without a body, no default `Content-Type` header is added.
+
 ## Use your webhook channel
 
 Once your webhook channel is configured and you've built its webhook request, you're ready to add your webhook channel to a workflow.