HeadRequest

Overview

The HeadRequest class enables the creation and execution of HTTP HEAD requests, allowing retrieval of metadata for resources without fetching their full content. It supports headers, authentication, and both synchronous and asynchronous execution.

Functionality

Headers can be added using the addHeader(headerName, value) method. Requests can be executed synchronously with executeRequest() or asynchronously through executeAsyncRequest(), which supports success and error callbacks. Authentication methods include username-password and windows authentication. The usePreemptiveAuthentication(b) method enables credentials to be sent in the header, useful for specific server configurations requiring immediate authorization.

Methods Summarized

Type	Name	Summary
Boolean	addHeader(headerName, value)	Add a header to the request.
void	executeAsyncRequest(username, password, workstation, domain, successCallbackMethod, errorCallbackMethod)	Execute the request method asynchronous.
void	executeAsyncRequest(username, password, workstation, domain, successCallbackMethod, errorCallbackMethod, callbackExtraArgs)	Execute the request method asynchronous using windows authentication.
void	executeAsyncRequest(username, password, successCallbackMethod, errorCallbackMethod)	Execute the request method asynchronous.
void	executeAsyncRequest(username, password, successCallbackMethod, errorCallbackMethod, callbackExtraArgs)	Execute the request method asynchronous using windows authentication.
void	executeAsyncRequest(successCallbackMethod, errorCallbackMethod)	Execute the request method asynchronous.
void	executeAsyncRequest(successCallbackMethod, errorCallbackMethod, callbackExtraArgs)	Execute the request method asynchronous using windows authentication.
Response	executeRequest()	Execute the request method.
Response	executeRequest(userName, password)	Execute the request method.
Response	executeRequest(userName, password, workstation, domain)	Execute a request method using windows authentication.
void	usePreemptiveAuthentication(b)	Whatever to use preemptive authentication (sending the credentials in the header, avoiding the server request to the client - useful when uploading files, as some http servers would cancel the first request from the client, if too big, as the authentication request to the client was not yet sent)

Methods Detailed

addHeader(headerName, value)

Add a header to the request.

Parameters

• String headerName ;

• String value ;

Returns: Boolean

Sample

method.addHeader('Content-type','text/xml; charset=ISO-8859-1')

executeAsyncRequest(username, password, workstation, domain, successCallbackMethod, errorCallbackMethod)

Execute the request method asynchronous. Success callback method will be called when response is received. Response is sent as parameter in callback. This Response can be a response with a different status code then just 200, it could also be 500, which is still a valid response from the server, this won't go into the error callback. So you need to test the Reponse.getStatusCode() for that to know if everything did go OK. If no response is received (request errors out), the errorCallbackMethod is called with exception message as parameter.

Parameters

• String username the user name

• String password the password

• String workstation The workstation the authentication request is originating from.

• String domain The domain to authenticate within.

• Function successCallbackMethod callbackMethod to be called after response is received

• Function errorCallbackMethod callbackMethod to be called if request errors out

Returns: void

Sample

method.executeAsyncRequest('username','password','mycomputername','domain',globals.successCallback,globals.errorCallback)

executeAsyncRequest(username, password, workstation, domain, successCallbackMethod, errorCallbackMethod, callbackExtraArgs)

Execute the request method asynchronous using windows authentication. Success callback method will be called when response is received. Response is sent as parameter in callback followed by any 'callbackExtraArgs' that were given. This Response can be a response with a different status code then just 200, it could also be 500, which is still a valid response from the server, this won't go into the error callback. So you need to test the Reponse.getStatusCode() for that to know if everything did go OK. If no response is received (request errors out, network errors), the errorCallbackMethod is called with exception message as parameter followed by any 'callbackExtraArgs' that were given.

Parameters

• String username the user name

• String password the password

• String workstation The workstation the authentication request is originating from.

• String domain The domain to authenticate within.

• Function successCallbackMethod callbackMethod to be called after response is received

• Function errorCallbackMethod callbackMethod to be called if request errors out

• Array callbackExtraArgs extra arguments that will be passed to the callback methods; can be used to identify from which request the response arrived when using the same callback method for multiple requests. Please use only simple JSON arguments (primitive types or array/objects of primitive types)

Returns: void

Sample

method.executeAsyncRequest('username','password','mycomputername','domain',globals.successCallback,globals.errorCallback, [callIDInt])

executeAsyncRequest(username, password, successCallbackMethod, errorCallbackMethod)

Execute the request method asynchronous. Success callback method will be called when response is received. Response is sent as parameter in callback. This Response can be a response with a different status code then just 200, it could also be 500, which is still a valid response from the server, this won't go into the error callback. So you need to test the Reponse.getStatusCode() for that to know if everything did go OK. If no response is received (request errors out), the errorCallbackMethod is called with exception message as parameter.

Parameters

• String username the user name

• String password the password

• Function successCallbackMethod callbackMethod to be called after response is received

• Function errorCallbackMethod callbackMethod to be called if request errors out

Returns: void

Sample

method.executeAsyncRequest(globals.successCallback,globals.errorCallback)

executeAsyncRequest(username, password, successCallbackMethod, errorCallbackMethod, callbackExtraArgs)

Execute the request method asynchronous using windows authentication. Success callback method will be called when response is received. Response is sent as parameter in callback followed by any 'callbackExtraArgs' that were given. This Response can be a response with a different status code then just 200, it could also be 500, which is still a valid response from the server, this won't go into the error callback. So you need to test the Reponse.getStatusCode() for that to know if everything did go OK. If no response is received (request errors out, network errors), the errorCallbackMethod is called with exception message as parameter followed by any 'callbackExtraArgs' that were given.

Parameters

• String username the user name

• String password the password

• Function successCallbackMethod callbackMethod to be called after response is received

• Function errorCallbackMethod callbackMethod to be called if request errors out

• Array callbackExtraArgs extra arguments that will be passed to the callback methods; can be used to identify from which request the response arrived when using the same callback method for multiple requests. Please use only simple JSON arguments (primitive types or array/objects of primitive types)

Returns: void

Sample

method.executeAsyncRequest(globals.successCallback,globals.errorCallback, [callIDInt])

executeAsyncRequest(successCallbackMethod, errorCallbackMethod)

Execute the request method asynchronous. Success callback method will be called when response is received. Response is sent as parameter in callback. This Response can be a response with a different status code then just 200, it could also be 500, which is still a valid response from the server, this won't go into the error callback. So you need to test the Reponse.getStatusCode() for that to know if everything did go OK. If no response is received (request errors out), the errorCallbackMethod is called with exception message as parameter.

Parameters

• Function successCallbackMethod callbackMethod to be called after response is received

• Function errorCallbackMethod callbackMethod to be called if request errors out

Returns: void

Sample

method.executeAsyncRequest(globals.successCallback,globals.errorCallback)

executeAsyncRequest(successCallbackMethod, errorCallbackMethod, callbackExtraArgs)

Execute the request method asynchronous using windows authentication. Success callback method will be called when response is received. Response is sent as parameter in callback followed by any 'callbackExtraArgs' that were given. This Response can be a response with a different status code then just 200, it could also be 500, which is still a valid response from the server, this won't go into the error callback. So you need to test the Reponse.getStatusCode() for that to know if everything did go OK. If no response is received (request errors out, network errors), the errorCallbackMethod is called with exception message as parameter followed by any 'callbackExtraArgs' that were given.

Parameters

• Function successCallbackMethod callbackMethod to be called after response is received

• Function errorCallbackMethod callbackMethod to be called if request errors out

• Array callbackExtraArgs extra arguments that will be passed to the callback methods; can be used to identify from which request the response arrived when using the same callback method for multiple requests. Please use only simple JSON arguments (primitive types or array/objects of primitive types)

Returns: void

Sample

method.executeAsyncRequest(globals.successCallback,globals.errorCallback, [callIDInt])

executeRequest()

Execute the request method.

Returns: Response

Sample

var response = method.executeRequest()

To be able to reuse the client, the response must be
closed if the content is not read via getResponseBody
 or getMediaData:

response.close()

executeRequest(userName, password)

Execute the request method.

Parameters

• String userName the user name

• String password the password

Returns: Response

Sample

var response = method.executeRequest()

To be able to reuse the client, the response must be
closed if the content is not read via getResponseBody
 or getMediaData:

response.close()

executeRequest(userName, password, workstation, domain)

Execute a request method using windows authentication.

Parameters

• String userName the user name

• String password the password

• String workstation The workstation the authentication request is originating from.

• String domain The domain to authenticate within.

Returns: Response

Sample

var response = method.executeRequest('username','password','mycomputername','domain');

usePreemptiveAuthentication(b)

Whatever to use preemptive authentication (sending the credentials in the header, avoiding the server request to the client - useful when uploading files, as some http servers would cancel the first request from the client, if too big, as the authentication request to the client was not yet sent)

Parameters

• Boolean b ;

Returns: void

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