kong.service.request

kong.service.request

Manipulation of the request to the Service

kong.service.request.enable_buffering()

Enables buffered proxying that allows plugins to access service body and response headers at the same time

Phases

  • rewrite, access

Returns

  • Nothing

Usage

  1. kong.service.request.enable_buffering()

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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

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

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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 querystring.

Phases

  • access

Parameters

  • path (string): The path string. Special characters and UTF-8 characters are allowed. Example: “/v2/movies” or “/foo/😀”

Returns

  • Nothing; throws an error on invalid inputs.

Usage

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

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kong.service.request.set_raw_query(query)

Sets the querystring of the request to the Service. The query argument is a string (without the leading ? character), and will not be 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

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

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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 should be given in all uppercase. Supported values are: "GET", "HEAD", "PUT", "POST", "DELETE", "OPTIONS", "MKCOL", "COPY", "MOVE", "PROPFIND", "PROPPATCH", "LOCK", "UNLOCK", "PATCH", "TRACE".

Returns

  • Nothing; throws an error on invalid inputs.

Usage

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

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kong.service.request.set_query(args)

Set the querystring 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 arguments 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 querystring will contain 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 querystring generation is needed, a raw querystring 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

  1. kong.service.request.set_query({
  2.   foo = "hello world",
  3.   bar = {"baz", "bla", true},
  4.   zzz = true,
  5.   blo = ""
  6. })
  7. -- Will produce the following query string:
  8. -- bar=baz&bar=bla&bar&blo=&foo=hello%20world&zzz

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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 is will also set the SNI of the request to the Service.

Phases

  • rewrite, access, balancer

Parameters

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

Returns

  • Nothing; throws an error on invalid inputs.

Usage

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

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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 will not 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 (stringnumberboolean): The header value. Example: “no-cache”

Returns

  • Nothing; throws an error on invalid inputs.

Usage

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

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kong.service.request.clear_header(header)

Removes all occurrences of the specified header in 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

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

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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 is will also set 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

  1. kong.service.request.set_header("X-Foo", "foo1")
  2. kong.service.request.add_header("X-Foo", "foo2")
  3. kong.service.request.set_header("X-Bar", "bar1")
  4. kong.service.request.set_headers({
  5.   ["X-Foo"] = "foo3",
  6.   ["Cache-Control"] = { "no-store", "no-cache" },
  7.   ["Bla"] = "boo"
  8. })
  10. -- Will add the following headers to the request, in this order:
  11. -- X-Bar: bar1
  12. -- Bla: boo
  13. -- Cache-Control: no-store
  14. -- Cache-Control: no-cache
  15. -- X-Foo: foo3

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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, one can give 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

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

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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 will be encoded with a MIME type. The encoding MIME type can be specified in the optional mimetype argument, or if left unspecified, will be chosen based on the Content-Type header of the client’s request.

If the MIME type is 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.

If the MIME type is multipart/form-data:

  • Encodes the arguments as multipart form data.

If the MIME type is 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.mej

If none of the above, returns nil and an error message indicating the body could not be encoded.

The optional argument mimetype can be one of:

  • application/x-www-form-urlencoded
  • application/json
  • multipart/form-data

If the mimetype argument is specified, the Content-Type header will be 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

  1. kong.service.set_header("application/json")
  2. local ok, err = kong.service.request.set_body({
  3.   name = "John Doe",
  4.   age = 42,
  5.   numbers = {1, 2, 3}
  6. })
  8. -- Produces the following JSON body:
  9. -- { "name": "John Doe", "age": 42, "numbers":[1, 2, 3] }
  11. local ok, err = kong.service.request.set_body({
  12.   foo = "hello world",
  13.   bar = {"baz", "bla", true},
  14.   zzz = true,
  15.   blo = ""
  16. }, "application/x-www-form-urlencoded")
  18. -- Produces the following body:
  19. -- bar=baz&bar=bla&bar&blo=&foo=hello%20world&zzz

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kong.service.request.disable_tls()

Disables the TLS handshake to upstream for ngx_stream_proxy_module. Effectively this overrides proxy_ssl directive to off setting for the current stream session.

Note that 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

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

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