resp_headers {httr2}

Extract headers from a response

Description

• resp_headers() retrieves a list of all headers.

• resp_header() retrieves a single header.

• resp_header_exists() checks if a header is present.

Usage

resp_headers(resp, filter = NULL)

resp_header(resp, header, default = NULL)

resp_header_exists(resp, header)

Arguments

resp

An HTTP response object, as created by req_perform().

filter

A regular expression used to filter the header names. NULL, the default, returns all headers.

header

Header name (case insensitive)

default

Default value to use if header doesn't exist.

Value

• resp_headers() returns a list.

• resp_header() returns a string if the header exists and NULL otherwise.

• resp_header_exists() returns TRUE or FALSE.

Examples

resp <- request("https://httr2.r-lib.org") |> req_perform()
resp |> resp_headers()
resp |> resp_headers("x-")

resp |> resp_header_exists("server")
resp |> resp_header("server")
# Headers are case insensitive
resp |> resp_header("SERVER")

# Returns NULL if header doesn't exist
resp |> resp_header("this-header-doesnt-exist")