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Kong Gateway
3.1.x
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kong.service.response

Module for manipulating the response from the Service.

kong.service.response.get_status()

Returns the HTTP status code of the response from the Service as a Lua number.

Phases

  • header_filter, body_filter, log

Returns

  • number|nil: The status code from the response from the Service, or nil if the request was not proxied (that is, if kong.response.get_source() returned anything other than "service").

Usage

kong.log.inspect(kong.service.response.get_status()) -- 418

kong.service.response.get_headers([max_headers])

Returns a Lua table holding the headers from the Service response. Keys are header names. Values are either a string with the header value, or an array of strings if a header was sent multiple times. Header names in this table are case-insensitive and dashes (-) can be written as underscores (_); that is, the header X-Custom-Header can also be retrieved as x_custom_header.

Unlike kong.response.get_headers(), this function only returns headers that are present in the response from the Service (ignoring headers added by Kong itself). If the request is not proxied to a Service (e.g. an authentication plugin rejected a request and produced an HTTP 401 response), then the returned headers value might be nil, since no response from the Service has been received.

By default, this function returns up to 100 headers. The optional max_headers argument can be specified to customize this limit, but must be greater than 1 and not greater than 1000.

Phases

  • header_filter, body_filter, log

Parameters

  • max_headers (number, optional): Sets a limit on the maximum number of headers that can be parsed.

Returns

  1. table: The response headers in table form.

  2. string: If more headers than max_headers are present, returns a string with the error "truncated".

Usage

-- Given a response with the following headers:
-- X-Custom-Header: bla
-- X-Another: foo bar
-- X-Another: baz
local headers = kong.service.response.get_headers()
if headers then
  kong.log.inspect(headers.x_custom_header) -- "bla"
  kong.log.inspect(headers.x_another[1])    -- "foo bar"
  kong.log.inspect(headers["X-Another"][2]) -- "baz"
end

kong.service.response.get_header(name)

Returns the value of the specified response header.

Unlike kong.response.get_header(), this function only returns a header if it is present in the response from the Service (ignoring headers added by Kong itself).

Phases

  • header_filter, body_filter, log

Parameters

  • name (string): The name of the header.

    Header names in are case-insensitive and are normalized to lowercase, and dashes (-) can be written as underscores (_); that is, the header X-Custom-Header can also be retrieved as x_custom_header.

Returns

  • string|nil: The value of the header, or nil if a header with name is not found in the response. If a header with the same name is present multiple times in the response, this function returns the value of the first occurrence of this header.

Usage

-- Given a response with the following headers:
-- X-Custom-Header: bla
-- X-Another: foo bar
-- X-Another: baz

kong.log.inspect(kong.service.response.get_header("x-custom-header")) -- "bla"
kong.log.inspect(kong.service.response.get_header("X-Another"))       -- "foo bar"

kong.service.response.get_raw_body()

Returns the raw buffered body.

Phases

  • header_filter, body_filter, log

Returns

  • string: The raw buffered body.

Usage

-- Plugin needs to call kong.service.request.enable_buffering() on `rewrite`
-- or `access` phase prior calling this function.

local body = kong.service.response.get_raw_body()

kong.service.response.get_body([mimetype[, max_args]])

Returns the decoded buffered body.

Phases

  • header_filter, body_filter, log

Parameters

  • mimetype (string, optional): The MIME type of the response (if known).
  • max_args (number, optional): Sets a limit on the maximum number of (what?) that can be parsed.

Returns

  • string: The decoded buffered body

Usage

-- Plugin needs to call kong.service.request.enable_buffering() on `rewrite`
-- or `access` phase prior calling this function.

local body = kong.service.response.get_body()