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Kong Gateway
2.8.x (latest)

kong.service.request

Module for manipulating the request sent to the Service.

kong.service.request.enable_buffering()

Enables buffered proxying, which allows plugins to access Service body and response headers at the same time.

Phases

  • rewrite, access

Returns

  • Nothing.

Usage

kong.service.request.enable_buffering()

kong.service.request.set_scheme(scheme)

Sets the protocol to use when proxying the request to the Service.

Phases

  • access

Parameters

  • scheme (string): The scheme to be used. Supported values are "http" or "https".

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.set_scheme("https")

kong.service.request.set_path(path)

Sets the path component for the request to the service.

The input accepts any valid normalized URI (including UTF-8 characters) and this API will perform necessary escaping according to the RFC to make the request valid.

Input should not include the query string.

Phases

  • access

Parameters

  • path (string): The path string. Special characters and UTF-8 characters are allowed, for example: "/v2/movies" or "/foo/😀".

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.set_path("/v2/movies")

kong.service.request.set_raw_query(query)

Sets the query string of the request to the Service. The query argument is a string (without the leading ? character), and is not processed in any way.

For a higher-level function to set the query string from a Lua table of arguments, see kong.service.request.set_query().

Phases

  • rewrite, access

Parameters

  • query (string): The raw querystring. Example: "foo=bar&bla&baz=hello%20world".

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.set_raw_query("zzz&bar=baz&bar=bla&bar&blo=&foo=hello%20world")

kong.service.request.set_method(method)

Sets the HTTP method for the request to the service.

Phases

  • rewrite, access

Parameters

  • method (string): The method string, which must be in all uppercase. Supported values are: "GET", "HEAD", "PUT", "POST", "DELETE", "OPTIONS", "MKCOL", "COPY", "MOVE", "PROPFIND", "PROPPATCH", "LOCK", "UNLOCK", "PATCH", or "TRACE".

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.set_method("DELETE")

kong.service.request.set_query(args)

Set the query string of the request to the Service.

Unlike kong.service.request.set_raw_query(), the query argument must be a table in which each key is a string (corresponding to an argument’s name), and each value is either a boolean, a string, or an array of strings or booleans. Additionally, all string values will be URL-encoded.

The resulting query string contains keys in their lexicographical order. The order of entries within the same key (when values are given as an array) is retained.

If further control of the query string generation is needed, a raw query string can be given as a string with kong.service.request.set_raw_query().

Phases

  • rewrite, access

Parameters

  • args (table): A table where each key is a string (corresponding to an argument name), and each value is either a boolean, a string, or an array of strings or booleans. Any string values given are URL-encoded.

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.set_query({
  foo = "hello world",
  bar = {"baz", "bla", true},
  zzz = true,
  blo = ""
})
-- Produces the following query string:
-- bar=baz&bar=bla&bar&blo=&foo=hello%20world&zzz

kong.service.request.set_header(header, value)

Sets a header in the request to the Service with the given value. Any existing header with the same name will be overridden.

If the header argument is "host" (case-insensitive), then this also sets the SNI of the request to the Service.

Phases

  • rewrite, access, balancer

Parameters

  • header (string): The header name. Example: “X-Foo”.
  • value (string|boolean|number): The header value. Example: “hello world”.

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.set_header("X-Foo", "value")

kong.service.request.add_header(header, value)

Adds a request header with the given value to the request to the Service. Unlike kong.service.request.set_header(), this function doesn’t remove any existing headers with the same name. Instead, several occurrences of the header will be present in the request. The order in which headers are added is retained.

Phases

  • rewrite, access

Parameters

  • header (string): The header name. Example: “Cache-Control”.
  • value (string|number|boolean): The header value. Example: “no-cache”.

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.add_header("Cache-Control", "no-cache")
kong.service.request.add_header("Cache-Control", "no-store")

kong.service.request.clear_header(header)

Removes all occurrences of the specified header from the request to the Service.

Phases

  • rewrite, access

Parameters

  • header (string): The header name. Example: “X-Foo”.

Returns

  • Nothing; throws an error on invalid inputs. The function does not throw an error if no header was removed.

Usage

kong.service.request.set_header("X-Foo", "foo")
kong.service.request.add_header("X-Foo", "bar")
kong.service.request.clear_header("X-Foo")
-- from here onwards, no X-Foo headers will exist in the request

kong.service.request.set_headers(headers)

Sets the headers of the request to the Service. Unlike kong.service.request.set_header(), the headers argument must be a table in which each key is a string (corresponding to a header’s name), and each value is a string, or an array of strings.

The resulting headers are produced in lexicographical order. The order of entries with the same name (when values are given as an array) is retained.

This function overrides any existing header bearing the same name as those specified in the headers argument. Other headers remain unchanged.

If the "Host" header is set (case-insensitive), then this also sets the SNI of the request to the Service.

Phases

  • rewrite, access

Parameters

  • headers (table): A table where each key is a string containing a header name and each value is either a string or an array of strings.

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.set_header("X-Foo", "foo1")
kong.service.request.add_header("X-Foo", "foo2")
kong.service.request.set_header("X-Bar", "bar1")
kong.service.request.set_headers({
  ["X-Foo"] = "foo3",
  ["Cache-Control"] = { "no-store", "no-cache" },
  ["Bla"] = "boo"
})

-- Will add the following headers to the request, in this order:
-- X-Bar: bar1
-- Bla: boo
-- Cache-Control: no-store
-- Cache-Control: no-cache
-- X-Foo: foo3

kong.service.request.set_raw_body(body)

Sets the body of the request to the Service.

The body argument must be a string and will not be processed in any way. This function also sets the Content-Length header appropriately. To set an empty body, you can provide an empty string ("") to this function.

For a higher-level function to set the body based on the request content type, see kong.service.request.set_body().

Phases

  • rewrite, access

Parameters

  • body (string): The raw body.

Returns

  • Nothing; throws an error on invalid inputs.

Usage

kong.service.request.set_raw_body("Hello, world!")

kong.service.request.set_body(args[, mimetype])

Sets the body of the request to the Service. Unlike kong.service.request.set_raw_body(), the args argument must be a table, and is encoded with a MIME type. The encoding MIME type can be specified in the optional mimetype argument, or if left unspecified, is chosen based on the Content-Type header of the client’s request.

Behavior based on MIME type in the Content-Type header:

  • application/x-www-form-urlencoded: Encodes the arguments as form-encoded. Keys are produced in lexicographical order. The order of entries within the same key (when values are given as an array) is retained. Any string values given are URL-encoded.

  • multipart/form-data: Encodes the arguments as multipart form data.

  • application/json: Encodes the arguments as JSON (same as kong.service.request.set_raw_body(json.encode(args))). Lua types are converted to matching JSON types.

If the MIME type is none of the above, this function returns nil and an error message indicating the body could not be encoded.

If the mimetype argument is specified, the Content-Type header is set accordingly in the request to the Service.

If further control of the body generation is needed, a raw body can be given as a string with kong.service.request.set_raw_body().

Phases

  • rewrite, access

Parameters

  • args (table): A table with data to be converted to the appropriate format and stored in the body.
  • mimetype (string, optional): can be one of:

Returns

  1. boolean|nil: true on success, nil otherwise.

  2. string|nil: nil on success, an error message in case of error. Throws an error on invalid inputs.

Usage

kong.service.set_header("application/json")
local ok, err = kong.service.request.set_body({
  name = "John Doe",
  age = 42,
  numbers = {1, 2, 3}
})

-- Produces the following JSON body:
-- { "name": "John Doe", "age": 42, "numbers":[1, 2, 3] }

local ok, err = kong.service.request.set_body({
  foo = "hello world",
  bar = {"baz", "bla", true},
  zzz = true,
  blo = ""
}, "application/x-www-form-urlencoded")

-- Produces the following body:
-- bar=baz&bar=bla&bar&blo=&foo=hello%20world&zzz

kong.service.request.disable_tls()

Disables the TLS handshake to upstream for ngx_stream_proxy_module. This overrides the proxy_ssl directive, effectively setting it to off for the current stream session.

Once this function has been called, it is not possible to re-enable TLS handshake for the current session.

Phases

  • preread, balancer

Returns

  1. boolean|nil: true if the operation succeeded, nil if an error occurred.

  2. string|nil: An error message describing the error if there was one.

Usage

local ok, err = kong.service.request.disable_tls()
if not ok then
  -- do something with error
end