URLSaveAsynchronous

URLSaveAsynchronous is being phased out in favor of URLDownloadSubmit, which was introduced experimentally in Version 11.2.

URLSaveAsynchronous["url","file",func]

performs a download to "file" in the background, calling func when an event is raised.

Details and Options

Types of events that may be raised:

	"data"	returns an empty list; can be used to indicate the connection has completed
	"progress"	returns information about the current connection of the form {dlnow,dltotal,ulnow,ultotal}
	"error"	indicates that an error occurred while attempting to connect to the URL
	"headers"	headers received from the web server
	"cookies"	a list of all known cookies
	"statuscode"	the status code returned by the server

The following options can be given:

Method	"GET"	method to use for request
"Parameters"	{}	parameters to be sent for the request
"Body"	""	contents of message body to be sent
"MultipartElements"	{}	list of multipart data elements to send
"Username"	""	username to use for the request
"Password"	""	password to use for the request
"Headers"	{}	headers to be manually sent to the HTTP server
"Cookies"	Automatic	cookies to pass to the server
"StoreCookies"	True	whether to store received cookies
"VerifyPeer"	True	verify authenticity using SSL certificates
"UserAgent"	Automatic	user agent string to send
"ReadTimeout"	0	time to allow for uploading or downloading data
"ConnectTimeout"	0	time to allow for connecting to the server
"Progress"	False	whether to raise a "progress" event
"Transfer"	Automatic	if Automatic, the "data" event returns once and returns all the data downloaded; if "Chunks", the "data" event is raised multiple times with the data downloaded since the last event was raised
"UserData"	None	any expression passed to this option will be stored for use of the AsynchronousTaskObject inside the event function; the data can be found by checking the options of AsynchronousTaskObject passed to the event function
BinaryFormat	True	whether to avoid textual interpretation of newlines or other data
"FollowRedirects"	True	whether to follow redirects

When an event is raised, the event function passed to URLSaveAsynchronous will be executed. The event functions will be passed three arguments, the AsynchronousTaskObject, the event name, and the data received from the event. Event functions are the only method for handling data received from URLSaveAsynchronous.

Examples

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Basic Examples (1)

Monitor progress while downloading the contents of a URL to a file:

Options (15)

"Method" (1)

"Method" can be used to specify the HTTP method used by the connection:

"Parameters" (1)

Specify the parameters that should be sent to the server:

"VerifyPeer" (1)

Verify that the SSL certificate used by the server is valid:

"Username" (1)

Specify the username that should be sent to the server:

"Password" (1)

Specify the password that should be sent to the server:

"UserAgent" (1)

Specify the user agent that should be sent to the server:

"Cookies" (1)

Manually control the cookies used by URLSaveAsynchronous:

"StoreCookies" (1)

If False, "StoreCookies" will not place any new cookies found while connecting to the site in the global cookie share:

"Headers" (1)

Specify headers to be sent to the server:

"BodyData" (1)

Specify the message body that should be sent when connecting to the server:

"MultipartData" (1)

Specify the contents of a multipart message body:

"ReadTimeout" (1)

Specify the maximum allotted time in seconds to finish downloading data from the server:

"ConnectTimeout" (1)

Specify the maximum allotted time in seconds to establish a connection to the server:

"Progress" (1)

If True, the "progress" event will be raised, returning information downloaded and uploaded about in-progress downloads:

"UserData" (1)

"UserData" is any expression containing information to be made available when an event is called:

Properties & Relations (1)

Use URLFetchAsynchronous to load the content directly into the Wolfram Language:

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