The client functions are used to exchange data with a HTTP server. There are specific functions for GET and POST as well as functions for general HTTP requests. Either plain text or encrypted communication can be used. Basic authentication is supported, as well as the use of a keystore, and if required a truststore, for the functions with an encrypted communication channel.

The HTTP client functions also support the use of proxy, see HTTP Proxy Setup (3.2) for information on how to setup HTTP proxy support.

Note

Note!

In all parameter descriptions below, "HTTP" may refer to both HTTP and HTTPS, and both HTTP/1 and HTTP/2.

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Code Block

string httpGet
    ( string host,
      string path,
      string protocol,			    //Optional
      int port,                     //Optional
      boolean secure,               //Optional
      int requestTimeout,           //Optional
      int connectionTimeout,        //Optional
      string username,              //Optional
      string password,              //Optional
      map<string, string> headers ) //Optional

Parameter

Description

host

The name or IP address of the HTTP server.

path

The path.

Info

title

Example - path

Code Block
/api/v2/doc

protocol

The protocol used: HTTP/1 or HTTP/2. The default value is HTTP/1. To use HTTP/2, you must set this value to "h2".

port

The port number to contact the HTTP server on. Port 80 is used for HTTP connection and 443 is used for HTTPS connection by default.

secure

Indicates whether the data should be sent in secure mode or not.

requestTimeout

The number of milliseconds to wait for a response. If the value is not specifically specified, the default timeout is used. The default value is 15000 milliseconds.

connectionTimeout

The number of milliseconds to wait for a connection to be established. If the value is not specifically specified, the default timeout is used. The default value is 3000 milliseconds.

username

A username for an account on the HTTP server.

password

Password associated with the username.

headers

Custom HTTP request headers.

Returns

Content from the HTTP server. It will be null if any part of the communication fails.

httpPost

This function uses the POST method to send content to an HTTP/2 server and receives the response.

Code Block

string httpPost
    ( string host, 
      string path,		
      bytearray content, 
      string contentType,
      string protocol,			    //Optional
      int port,                     //Optional 
 	  boolean secure,               //Optional 
      int requestTimeout,           //Optional
      int connectionTimeout,        //Optional 
      string username,              //Optional
      string password,              //Optional
      map<string, string> headers ) //Optional

Parameter

Description

host

The name or IP address of the HTTP server.

path

The path

Info

title

Example - path

Code Block
/api/v2/doc

bytearraycontent

The body of the request in bytearray format.

contentType

The MIME type of the content.

Info

title

Example - contentType

Code Block
application/json

protocol

The protocol used: HTTP/1 or HTTP/2. The default value is HTTP/1. To use HTTP/2, you must set this value to "h2".

port

The port number to contact the HTTP server on. Port 80 is used for HTTP connection and 443 is used for HTTPS connection by default.

secure

Indicates whether the data should be sent in secure mode or not.

requestTimeout

The number of milliseconds to wait for a response. If the value is not specifically specified, the default timeout is used. The default value is 15000 milliseconds.

connectionTimeout

The number of milliseconds to wait for a connection to be established. If the value is not specifically specified, the default timeout is used. The default value is 3000 milliseconds.

username

A username for an account on the HTTP server.

password

Password associated with the username.

headers

Custom HTTP request headers.

Returns

Content from the HTTP server. It will be null if any part of the communication fails.

httpReq

This function makes an HTTP request and uses the specified method, e g GET, POST, PUT etc.

Code Block

string httpRequest
    ( string method,	
	  string hosturl,	
	  map<string, string> headers,
      string path,
      bytearraystring content,
      string contentType, 
	  string protocol,			    //Optional
	  int port,					    //Optional
	  boolean secure,			    //Optional
      int requestTimeout,		    //Optional
	  int connectionTimeout,	    //Optional
	  string username,			    //Optional
	  string password, 			    //Optional
      map<string,string> headers )	//Optional

Parameter	Description
`method`	The HTTP method.

host

url

The

name or IP address

host and port of the HTTP server

.

, e g http://host:port

header

Key-value pairs containing request header fields

path

The path

Info

title

Example - path

Code Block
/api/v2/doc

content

The body of the request in bytearray format.

contentType

The MIME type of the content.

Info

title

Example - contentType

Code Block
application/json

protocol

The protocol used: HTTP/1 or HTTP/2. The default value is HTTP/1. To use HTTP/2, you must set this value to "h2".

port

The port number to contact the HTTP server on. Port 80 is used for HTTP connection and 443 is used for HTTPS connection by default.

secure

Indicates whether the data should be sent in secure mode or not.

requestTimeout

The number of milliseconds to wait for a response. If the value is not specifically specified, the default timeout is used. The default value is 15000 milliseconds.

connectionTimeout

The number of milliseconds to wait for a connection to be established. If the value is not specifically specified, the default timeout is used. The default value is 3000 milliseconds.

username

A username for an account on the HTTP server.

password

Password associated with the username.

headers

Custom HTTP request headers.

Returns

A response from the HTTP server. It will be null if any part of the communication fails.

httpMultipartPost

This function uses the POST method to send multipart binary contents to an HTTP server and receives the response.

Code Block

bytearray httpMultipartPost
    ( string host,
	  string path,
	  list<MultipartSegmentUDR> content,
	  string protocol,			    //Optional
   	  int port, 				    //Optional 
	  boolean secure,			    //Optional
      int requestTimeout,		    //Optional
	  int connectionTimeout,	    //Optional
      string username,              //Optional
      string password,              //Optional
      map<string, string> headers ) //Optional

Parameter	Description
`host`	The name or IP address of the HTTP server.
`path`	The path on the server to which we should do the POST.
content	The body of the the request.
protocol	The protocol used: HTTP/1 or HTTP/2. The default value is HTTP/1. To use HTTP/2, you must set this value to "h2".
`port`	The port to be used for the HTTP server. Port 80 is used for HTTP connection and 443 is used for HTTPS connection by default.
`secure`	Indicates whether the data should be sent in secure mode or not.
`requestTimeout`	The number of milliseconds to wait for a response. If the value is not specifically specified, the default timeout is used. The default value is 15000 milliseconds.
`connectionTimeout`	The number of milliseconds to wait for a connection to be established. If the value is not specifically specified, the default timeout is used. The default value is 3000 milliseconds.
`username`	Username for the account to be used on the HTTP server.
`password`	Password associated with the username.
`headers`	Custom HTTP request headers.
Returns	A bytearray from the HTTP server. It will be null if any part of the communication fails.

Note

title

Note!

For optional parameters, you need to state null in case you specify subsequent optional parameters. If there are no subsequent parameters, you do not have to state anything.

Info

title	Example

Code Block
httpMultipartPostURL( "mypath", mybody, "myhost", 0, null, "myusername");

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If the two properties above are not set in the relevant Execution Context <pico>.conf, MZ Default Keystore is used.

The property https.apl.keystore_location represents the location of the keystore and the property https.apl.keystore_passphrase represents the passphrase for that keystore.

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Code Block
keytool -keystore /var/opt/mz/HttpdExec.keystore -genkey -keyalg RSA

title

Note

Note!

The Keystore passphrase must be the same as the passphrase used by the certificate.

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A truststore is a keystore that is used when deciding what to trust - truststore stores certificates from third parties. If you receive data from an entity that you already trust, and if you can verify that the entity is what it claims to be, you can assume that the data does in fact come from that entity.

By Default, Image Modified uses its own truststore, which always trusts any server connection.

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After setting the property https.apl.userdefined.truststore to true, if you want to use a specific truststore, set the following properties in the relevant ECs:

https.apl.truststore_location
https.apl.truststore_passphrase

If you do not set these two properties, the Java Default Truststore is used.

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Versions Compared

Old Version 4

New Version 5

Key

Note!

Example - path

httpPost

Example - path

Example - contentType

httpReq

Example - path

Example - contentType

httpMultipartPost

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Page Comparison

Versions Compared

Old Version 4

New Version 5

Key

Note!

Example - path

httpPost

Example - path

Example - contentType

httpReq

Example - path

Example - contentType

httpMultipartPost

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Note!