send_http_request
The send_http_request function sends an HTTP request.
Syntax
send_http_request( params )
Arguments
| Argument | Description |
|---|---|
params
|
(table) Named parameters that configure the HTTP request. The table maps parameter names (string) to parameter values. For information about the parameters that you can set, see the following table. |
Named Parameters
| Named Parameter | Description |
|---|---|
url
|
(string) The full URL for the HTTP request. If you provide a URL, the other parameters used to build the URL are not used. |
method
|
(string) The HTTP method to use (GET, POST, or DELETE). The default is "GET". |
headers
|
(table) A table of HTTP headers to send with the request. The table must map header names to values. |
content
|
(string) For HTTP POST, the data to be sent with the post. |
site
|
(string) The site to which the HTTP request is sent. |
port
|
(integer) The port to which the HTTP request is sent. By default, the request is sent to port 80. |
uri
|
(string) The URI to request. |
params
|
(table) Additional parameters for the request. The table must map parameter names to parameter values. |
section
|
(string) The name of a section in the configuration file that contains transport related parameters such as SSL or proxy settings. For a list of the HTTP Client configuration parameters that you can set in the configuration file, see HTTP Client Parameters. |
options
|
(table) A table of HTTP client options, and values, to use for the request. For a list of the HTTP Client options that you can set in the table, see HTTP Client Parameters. |
Returns
String. The HTTP response.
The send_http_request function can throw an exception if the request fails. You can catch an exception by calling send_http_request using the Lua function pcall.
Examples
The following example shows how to make a simple request:
local wikipedia_page = send_http_request(
{url = "http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol"} )
The following example shows how to make the same request but catch any exceptions with the Lua pcall function:
local result, response = pcall ( send_http_request,
{url = "http://en.wikipedia.org/wiki/Hypertext_Transfer_Protocol"} )
When the send_http_request function is successful, the result variable is true and response contains the response. If an exception is thrown from send_http_request, the result variable is false and response contains the error message.
The following examples demonstrate how to add additional named parameters:
local google_search = send_http_request(
{site = "www.google.co.uk", port = 80, uri = "/search",
params = {q = "http protocol", safe = "active"}} )local search = send_http_request(
{site = "www.site.com", port = 80, uri = "/query",
params = {text = "http headers", maxresults = "10"}
headers = { Cache-Control = "no-cache" }} )