Headers

API Keys and Custom Headers

Learn how to authenticate requests using API keys and how to work with custom HTTP headers in Postman, including placement options and common conventions.

Request and Response Anatomy

A breakdown of the parts that make up an HTTP request (URL, headers, body) and response (status line, headers, body) as seen in Postman.

Configuring Headers and Cookies

Use the HTTP Header Manager and HTTP Cookie Manager to simulate realistic browser and API-client behavior, including auth headers and session cookies.

Nginx Security Headers

Learn how to configure HTTP response headers in Nginx to protect users from clickjacking, MIME-sniffing, XSS, and insecure transport.

Headers Exchange Explained

Discover how RabbitMQ's headers exchange routes messages by matching message header attributes instead of routing keys, using x-match rules.

Security Headers Explained

HTTP security headers let a server instruct the browser to enforce protective behaviors, such as blocking mixed content, refusing to be framed, or restricting…

gRPC Metadata and Headers

Learn how gRPC carries cross-cutting information like auth tokens and trace IDs via initial and trailing metadata, separate from the protobuf message body.

HTTPie Cheat Sheet

Command syntax, headers, auth, and JSON shorthand for making human-friendly HTTP requests from the terminal with HTTPie.