What does header mean in software engineering?

A header is metadata information placed at the beginning of a request, response, file, or document. In HTTP communication, headers are key-value pairs that provide instructions about how to process the data that follows. For example, a Content-Type header tells the system what format the data is in.

How do you use header in a sentence at work?

You use header as a noun in phrases like: Set the authorization header before sending the request, Check the response headers for error details, or Add a custom header to the API call. Use verbs like set, add, include, or check with headers.

Is header formal or informal?

Header is neutral in formality. It is equally appropriate in casual standup conversations (Did you add the header?) and formal documentation (The request must include the specified headers). It is a standard technical term used in all professional settings.

What are the most common headers in web development?

Common headers include Content-Type (specifies data format), Authorization (carries authentication tokens), Accept (tells the server what formats the client accepts), User-Agent (identifies the client), and Cache-Control (controls caching behavior). Each serves a specific purpose in HTTP communication.

Can header be used as a verb?

In technical English, header is primarily a noun. While some people informally say to header something, the correct usage is to set, add, or include a header. Using header as a verb is considered non-standard and should be avoided in professional settings.

header meaning in tech — Speak Tech English

Commonness	5/5
Versatility	5/5
Formality	CasualFormalNeutral
Spoken ↔ Written	SpokenWrittenBoth
Directness ↔ Diplomatic	DirectDiplomaticDirect
Region	US and UK

Say it like this

✓Set the headers before sending the request

✓Check the response headers for errors

✓Add the authorization header to your request

Real examples

in a code review

"Did you remember to include the Content-Type header in your POST request?"

in a standup

"I spent two hours debugging why the API call failed, then realized I forgot to add the authentication header."

in a team meeting

"We need to document which headers are required and which ones are optional for the new endpoint."

Don't say this

Handle with care. Avoid confusing HTTP headers with document headers or heading styles. Context determines which meaning applies.

✕The header is sending in the body of the request.

✓The header is included in the request, not in the body.— Headers are separate from the body; they provide metadata about the request itself, not data within it.

✕We forgot to header the request with authentication.

✓We forgot to include the authentication header in the request.— Header is a noun, not a verb in this context. Use include, add, or set with headers.

✕The server returned an error in its header.

✓The server returned an error in the response headers.— Headers are typically plural when referring to multiple key-value pairs, or use the singular for a specific header.

Other forms

noun

header

"The API request requires an authorization header."

noun (plural)

headers

"Make sure all the headers are formatted correctly."

noun (compound)

header field

"The User-Agent header field identifies the client making the request."

Often used with

set/add/include a headerThese verbs are used to place headers in requests or responses

HTTP headerMost common phrase referring to headers in web communication

header valueThe specific data or content assigned to a header key

custom headerHeaders that are user-defined rather than standard protocol headers

response headerHeaders returned by a server in response to a client request

request headerHeaders sent by a client as part of its request to a server

Similar words

metadataBroader term; headers are a specific type of metadata

attributeGeneral term for properties; less specific than header in tech contexts

fieldUsed similarly in some contexts but less precise for HTTP communication

Opposites

body (the main content after headers)payload (the data being sent, distinct from headers)

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Practice

Try it

4 quick exercises

Pick the most natural phrasing

1. Your colleague asks how to send authentication information with an API call. What do you say?

You need to put the token in the authorization header.You must header the request with the token.Add the token to the body of the request.The header requires a token value.

Complete the sentence

2. Always check the _______ to see what format the server is expecting for the response.

Spot the mistake

3. Which sentence uses header incorrectly?

The Content-Type header tells the server what kind of data you are sending.We need to header this request with authentication information.Response headers contain metadata about the server response.Make sure the custom header is included in your API call.

Rewrite naturally

4. Rewrite this sentence more naturally using header: 'The information at the top of the request tells the system how to read the rest of the information.'

Questions

Quick poll

Have you said "header" in a standup this week?

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