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Overview 

This document contains a description of REST Initiator Transport Adaptor for FixEdge and common steps required to configure and use it. 

FIXEdge REST initiator adaptor is a module in FIXEdge which sends FIX message from Business Layer to destination system as an http(s) REST POST request. 

The adapter has the following features:

  • Send Raw FIX message
  • Send FIX message in JSON format
  • Send XmlData (213) tag data
  • Secure connection support
  • Proxy server support
  • Message validation

Outgoing message representations 

An outgoing HTTP message body can be formed in several modes:

  • Raw FIX message with SOH as a delimiter
  • JSON representation of FIX messages tags and values
  • content of tag XmlData (213) of the FIX message

The message conversion type is specified with TransportLayer.RestOutTA.ConversionMethod parameter.

Raw FIX message

Example of raw FIX message (pipe symbol stands for SOH symbol): 

8=FIX.4.2|9=153|35=D|49=BLP|56=SCHB|34=1|50=30737|97=Y|52=20000809-20:20:50|11=90001008|1=10030003|21=2|55=TESTA|54=1|38=4000|40=2|59=0|44=30|47=I|60=20000809-18:20:32|10=061| 

JSON

Example of JSON message (contains repeating groups)

{"35":"E","50":"30737","116":"OMS1","52":"20150101-01:01:01.080","66":"List1","394":"3","68":"2","73":[{"11":"0003","67":"1","100":"DSMD","55":"MSFT","54":"1","38":"100"},{"11":"0004","67":"2","100":"DSMD","55":"IBM","54":"2","38":"200"}]}

Session level tags: BeginString(8), BodyLength(9), SenderCompID(49), TargetCompID(56) and CheckSum(10) are not inserted in output JSON body. 

Body of XmlData (213) tag

Tags XmlData (213) and XmlDataLen (212) can present in any message type. One of the common ways to use it is to create an XML message (e.g. non-FIX MsgType) (n) as FIX message wrapper over non-FIX message. The Rest Adapter can extract the data from the XmlData (213) and send it to the external services.

The example of exporting data from tag XmlData (213) (FIX message 35=n contain another FIX message 35=AE (marked orange) within XmlData (213) ):

Input (from BL)

Output (sent to destination system)

8=FIX.4.4| 9=259| 35=n| 49=0| 56=0| 34=1| 52=20200317-10:23:55.068| 212=201| 213=8=FIX.4.4| 9=168| 35=E| 49=0|

56=RESTAdapter| 34=1| 50=30737| 66=List1| 116=OMS1| 52=20191101-11:11:01.080| 394=3| 68=2|

73=2| 11=0003| 67=1| 100=DSMD| 55=11| 54=1| 38=100| 11=0004| 67=2| 100=DSMD| 55=12| 54=2| 38=200| 10=235| | 10=219|

8=FIX.4.4| 9=168| 35=E| 49=0| 56=RESTAdapter| 34=1| 50=30737| 66=List1| 116=OMS1| 52=20191101-11:11:01.080| 394=3| 68=2| 73=2| 11=0003| 67=1| 100=DSMD| 55=11| 54=1| 38=100| 11=0004| 67=2| 100=DSMD| 55=12| 54=2| 38=200| 10=235|


Using security and non-secure connections 

The Transport Adapter supports secure (https) and non-secure (http) connections, for details see. 

Message validation 

Message validation is configured by using TransportLayer.RestOutTA.ValidateFIXMessage

Example1: validation is off: 

TransportLayer.RestOutTA.ValidateFIXMessage = No 

Example2:  a message is not sent, OnUndelieveredEvent on BL is generated: 

TransportLayer.RestOutTA.ValidateFIXMessage = ValidateAndReject 

Example of log record:

2020-02-12 12:18:11,971 UTC   WARN    [RestInitiatorClient2]  140246545049344  FIX validation error: Incorrect integer value in tag 67: 'check'[Group tag=73, Entry #=0] in message New Order - List (E) with sequence number 3.2020-02-12 12:18:11,971 UTC   ERROR   [RestInitiatorClient2]  140246545049344  Error in sendToClient: Incorrect integer value in tag 67: 'check'[Group tag=73, Entry #=0] in message New Order - List (E) with sequence number 3.

For details see. 

Error handling 

Error information about HTTP error codes is saved to log, see logging section

A user can handle errors with Business Layer Engine in case of  error responses from the destination system (for example receiving 400 or 500 error codes).   

An OnUndeliveredMessageEvent is generated and an undelivered message is transferred to FIXEdge Business Layer for further processing. In the example below rejected message from RestInitiatorClient will be sent to FIX session : 

<OnUndeliveredMessageEvent> 
    <Source> 
        <Client Name="RestInitiatorClient"/> 
     </Source> 
   <Action> 
        <Send><FixSession SenderCompID="FE" TargetCompID="SC"/></Send> 
    </Action> 
</OnUndeliveredMessageEvent> 


Logging 

The transport adapter uses category RestOutTA for logging REST events.

This category cannot be re-configured


The category of the other actions can be defined by the user in order to track Transport Adapters events from different adapters.

The list of logged actions:

  • Adapter initialization
  • Parsing information, validation errors
  • Configuration parameters
  • sent and received messages

Additional information about logging configuration can be found there: 

Configuration example #1 (Enable extra logging levels)

The following configuration example shows how to enable Note, Debug and Trace level of REST events; specifies logging category for RestOutTA1 as RestInitiatorClient1 and enable Note, Debug and Trace level of RestOutTA1 adapter.

FIXEdge.properties
TransportLayer.RestOutTA1.LogCategory = RestInitiatorClient1 
Log.RestOutTA.Device = File 
Log.RestOutTA.DebugIsOn = true 
Log.RestOutTA.TraceIsOn = true 
Log.RestOutTA.NoteIsOn = true 
Log.RestInitiatorClient1.Device = File 
Log.RestInitiatorClient1.DebugIsOn = true 
Log.RestInitiatorClient1.TraceIsOn = true 
Log.RestInitiatorClient1.NoteIsOn = true

FIXEdge log example for this configuration

FIXEdge.log
2019-10-29 13:34:04,676 UTC   INFO    [RestOutTA]  10012  Log Category is registered to FileLogger 
    Category name: RestOutTA 
    File name: '../FIXEdge1/log/FixEdge.log' 
    File record format: %date{ISO8601} %timezone   %level%tablevel   [%logger]  %thread  %message 
    Create unique file name: off 
    Recreate file on restart: off 
    Flush on each record: on 
    Time zone: UTC 
    Log rotate is on: 
        size limit is 104857600 
        File Limit: 10 
        Rotate directory: ../FIXEdge1/log 
    Note: Filename is shared with other categories 
2019-10-29 13:34:04,677 UTC   DEBUG   [RestInitiatorClient1]  10012  Setting up HTTP session with jsonplaceholder.typicode.com:80 endpoint 
2019-10-29 13:34:04,677 UTC   DEBUG   [RestInitiatorClient1]  10012  Timeout for client 'RestInitiatorClient1' = 60. 
2019-10-29 13:34:04,677 UTC   INFO    [CC_Layer]  10012  Client RestInitiatorClient1 has logged in 
2019-10-29 13:34:04,677 UTC   INFO    [RestInitiatorClient1]  10012  REST Initiator TA v.0.0.0.1 started. 
2019-10-29 13:34:04,677 UTC   INFO    [TransportLayer]  10012  Module 'TransportLayer' version 0.1.1.5 was loaded. 
2019-10-29 13:34:04,677 UTC   INFO    [CC_Layer]  10012  Admin REST API is disabled 
2019-10-29 13:34:04,677 UTC   INFO    [CC_Layer]  10012  Control Centre XML Sockets Monitor is started 
2019-10-29 13:34:04,677 UTC   INFO    [CC_Layer]  10012  Control Centre Layer is initialized 
2019-10-29 13:34:04,677 UTC   INFO    [CC_Layer]  10012  FixEdge pid file '../FIXEdge1/log/FixEdge.pid'. 
2019-10-29 13:34:04,678 UTC   INFO    [XmlSockImpl]  12532  Log Category is registered to FileLogger 

Configuration example #2 (Log to separate file)

The following configuration example shows how to log Transport Adapter events into a separate log file FIXEdge1/log/RestOutTA.log

FIXEdge.properties
TransportLayer.RestOutTA1.LogCategory = RestInitiatorClient1 
Log.RestOutTA.Device = File  
Log.RestOutTA.DebugIsOn = true 
Log.RestOutTA.TraceIsOn = true 
Log.RestOutTA.NoteIsOn = true 
Log.RestOutTA.File.Name = FIXEdge1/log/RestOutTA.log 
Log.RestInitiatorClient1.Device = File 
Log.RestInitiatorClient1.DebugIsOn = true 
Log.RestInitiatorClient1.TraceIsOn = true 
Log.RestInitiatorClient1.NoteIsOn = true 
Log.RestInitiatorClient1.File.Name = FIXEdge1/log/RestOutTA.log 

RestOutTA.log example

RestOutTA.log
2019-10-29 13:40:07,830 UTC   INFO    [RestInitiatorClient1]  18488  Log Category is registered to FileLogger 
    Category name: RestInitiatorClient1 
    File name: '../FIXEdge1/log/RestOutTA.log' 
    File record format: %date{ISO8601} %timezone   %level%tablevel   [%logger]  %thread  %message 
    Create unique file name: off 
    Recreate file on restart: off 
    Flush on each record: on 
    Time zone: UTC 
    Log rotate is on: 
        size limit is 104857600 
        File Limit: 10 
        Rotate directory: ../FIXEdge1/log 
2019-10-29 13:40:07,830 UTC   DEBUG   [RestInitiatorClient1]  18488  Setting up HTTP session with jsonplaceholder.typicode.com:80 endpoint 
2019-10-29 13:40:07,830 UTC   DEBUG   [RestInitiatorClient1]  18488  Timeout for client 'RestInitiatorClient1' = 60. 
2019-10-29 13:40:07,831 UTC   INFO    [RestInitiatorClient1]  18488  REST Initiator TA v.0.0.0.1 started. 

Configuration  

See How to configure adapters in FIXEdge for a guide on how to enable Transport Adapter functionality in FIXEdge.

Using proxy server feature

Transport Adapter supports proxy server configuration for cases when a direct connection from the FIXEdge server to the destination system is forbidden. 

A host, port, user and password for proxy connection should be configured in FIXEdge.properties file, for details, see. 

Property 

Description 

Required 

Values/Examples 

Configuration parameters 




TransportLayer.TransportAdapters

The list of user-defined Transport Adapter names. The several instances should be separated by a comma 

The following configuration will show configuration parameters for an adapter with the name TransportLayer.RestOutTA, i.e. TransportLayer.TransportAdapters TransportLayer.RestOutTA

No


TransportLayer.RestOutTA.Description

The description of the adapter. This information is shown in Monitoring API

Yes 

REST Initiator Client 

TransportLayer.RestOutTA.DllName

Path to Transport Adapter library 

Yes 

Linux:

  • libREST_Initiator_TA-gcc44-MD-x64.so

Windows:

  • bin/REST_Initiator_TA-vc10-MD-x64.dll

TransportLayer.RestOutTA.Type 

Transport Adapter library type 

depricated parameter

No

 Supported values:

  • DLL

TransportLayer.RestOutTA.ClientID

User defined id/name for referencing to Transport Adapters in Business Logic configuration

Yes 

 RestInitiatorClient 

TransportLayer.RestOutTA.LogCategory

Transport adaptor log category. 

Yes 

 RestInitiatorClient 

TransportLayer.RestOutTA.Protocol 

Connection protocol

Yes 

Supported values:

  • HTTP - for non-secure connections
  • HTTPS - for secure connections 

TransportLayer.RestOutTA.ServerHost

The destination host or IP address for sending messages 

Yes 


TransportLayer.RestOutTA.ServerPort 

The Port for the destination host 

Yes 


TransportLayer.RestOutTA.URI

URI for HTTP request.
The resulted URI will be composed as:

<Protocol>://<ServerHost>:<ServerPort><URI>

Yes 

/messages 

TransportLayer.RestOutTA.SendingTimeout

Time for waiting for the response. After this time the adapter tries next time  to start a connection

The maximum value of this time may be limited by Operating System 

No 

Default value = 0 - no timeout 

TransportLayer.RestOutTA.SendingMaxAttempts

Number of connection attempts 

No 

Default value = 2 

TransportLayer.RestOutTA.ConversionMethod 

The conversion method is the way the outgoing message is converted

Yes 

Supported values:

  • Raw - Raw FIX message with SOH as a delimiter
  • NumericTagValueMapping - JSON representation of FIX messages tags and values
  • WrapInXmlMessage - content of tag XmlData (213) of the FIX message

Proxy connection parameters




TransportLayer.RestOutTA.ProxyHost

Proxy host 

No 


TransportLayer.RestOutTA.ProxyPort

Proxy port 


Conditional
Mandatory if ProxyHost is set


TransportLayer.RestOutTA.ProxyLogin

Proxy user name 

No 


TransportLayer.RestOutTA.ProxyPassword

Proxy user password 

Conditional
Mandatory if ProxyLogin is set


Validation parameters




TransportLayer.RestOutTA.ValidateFIXMessage  

Enables/disables validation of FIX message

The validation isn't applied for raw conversion method. 
I.e.  TransportLayer.RestOutTA.ConversionMethod = Raw

No 

Supported values:

  • No - the validation is disabled. Default 
  • ValidateAndReject - validation is enabled.
    The Adapter doesn't send a message to BL if the message doesn't pass validation. 
  • ValidateAndWarn - validation is enabled.
    The Adapter sends a message to BL even if the message doesn't pass validation. The validation error warning message is logged in this case  

Security parameters




TransportLayer.RestOutTA.HTTPS.PrivateKey

path to the private key file



Conditional

Mandatory if 
Protocol = HTTPS



TransportLayer.RestOutTA.HTTPS.Certificate

path to certificate key file 

Conditional 
Mandatory if 
Protocol = HTTPS


TransportLayer.RestOutTA.HTTPS.PrivateKeyPassword

password for encrypted private key file 

No


TransportLayer.RestOutTA.authHeader 

The HTTP header name for authentication. 

All outgoing requests will contain the HTTP header with the value of the parameter. 

No 


TransportLayer.RestOutTA.authValue

Authentication value in HTTP header 

No 


Configuration example 

A typical configuration for windows

FIXEdge.properties
TransportLayer.TransportAdapters = TransportLayer.RestOutTA1
TransportLayer.RestOutTA1.Description = RESTInitiatorClient1 
TransportLayer.RestOutTA1.DllName = bin/REST_Initiator_TA-vc10-MD-x64.dll 
TransportLayer.RestOutTA1.Type = DLL 
TransportLayer.RestOutTA1.ClientID = RestInitiatorClient1 
TransportLayer.RestOutTA1.LogCategory = RestInitiatorClient1 
TransportLayer.RestOutTA1.Protocol = HTTP 
TransportLayer.RestOutTA1.ServerHost = jsonplaceholder.typicode.com 
TransportLayer.RestOutTA1.ServerPort = 80 
#TransportLayer.RestOutTA1.ProxyHost = 
#TransportLayer.RestOutTA1.ProxyPort = 
#TransportLayer.RestOutTA1.ProxyLogin = 
#TransportLayer.RestOutTA1.ProxyPassword = 
TransportLayer.RestOutTA1.URI = /posts 
TransportLayer.RestOutTA1.SendingTimeout = 60 
TransportLayer.RestOutTA1.SendingMaxAttempts = 2 
TransportLayer.RestOutTA1.ConversionMethod = NumericTagValueMapping 
TransportLayer.RestOutTA1.ValidateFIXMessage = ValidateAndWarn 
Log.RestOutTA.Device = File Console    
Log.RestOutTA.DebugIsOn = true 
Log.RestOutTA.TraceIsOn = true 
Log.RestOutTA.NoteIsOn = true 
Log.RestOutTA.File.Name = FIXEdge1/log/RestOutTA.log 
Log.RestInitiatorClient1.Device = File 
Log.RestInitiatorClient1.DebugIsOn = true 
Log.RestInitiatorClient1.TraceIsOn = true 
Log.RestInitiatorClient1.NoteIsOn = true 
Log.RestInitiatorClient1.File.Name = FIXEdge1/log/RestOutTA.log 

Example of a configuration block with security parameters

FIXEdge.properties
TransportLayer.RestOutTA1.Protocol = HTTPS 
TransportLayer.RestOutTA1.HTTPS.PrivateKey = FIXEdge1/conf/TestRESTAPI.key 
TransportLayer.RestOutTA1.HTTPS.Certificate = FIXEdge1/conf/TestRESTAPI.crt 
TransportLayer.RestOutTA1.authHeader = apikey 
TransportLayer.RestOutTA1.authValue = QWERTY0123456789

Monitoring Rest Initiator Transport Adapter with FIXICC

REST Initiator Transport Adapter is displayed in FIXICC in the tree in the "servers" list at the left. In the example below RestOutTA1 is an adapter name and ResInitiatorClient1 is ClientID. Messages statistics is shown at the right -

  • total number of sent messages
  • total number of received messages
  • total number of rejected messages 

On the picture below the configuration with two Rest Initiator adapters is shown (RestOutTA1 and RestOutTA2).


Routing 

The Transport Adapter can be accessed in BL via ClientIDparameter. See the example of BL_Config.xml rule below (ClientID=RestInitiatorClient1): 

BL_Config.xml
<Rule> 
          <Source> 
               <FixSession SenderCompID="FIXCLIENT1" TargetCompID="FIXEDGE"/> 
          </Source> 
               <Action> 
                    <Send Name="RestInitiatorClient1" /> 
               </Action> 
</Rule> 

Troubleshooting 

In all trouble cases first of all check error information in REST TA logfile (defined by Log.*.File.Name parameter) and FIXEdge.log.  

To check the Adapter is started correctly search for the string "REST Initiator", the example of output: 

REST Initiator TA v.0.0.0.1 started 

Host not found 

Description 

Message is not sent, adapter is initiated correctly, user gets error in REST TA log file: 

2019-10-24 06:46:21,622 UTC DEBUG [RestInitiatorClient1] 27532 sendRequest attempt 1 of 2 
2019-10-24 06:46:21,629 UTC ERROR [RestInitiatorClient1] 27532 Client 'RestInitiatorClient1' could not send POST request to the server (2) 'jsonplaceholder.typicodes.com'. Reason: Host not found: jsonplaceholder.typicodes.com. 
2019-10-24 06:46:21,629 UTC DEBUG [RestInitiatorClient1] 27532 sendRequest attempt 2 of 2 
2019-10-24 06:46:21,630 UTC ERROR [RestInitiatorClient1] 27532 Client 'RestInitiatorClient1' could not send POST request to the server (2) 'jsonplaceholder.typicodes.com'. Reason: Host not found: jsonplaceholder.typicodes.com. 
2019-10-24 06:46:21,631 UTC WARN [RestInitiatorClient1] 27532 sendToClient failed. Sending message reject. 
2019-10-24 06:46:21,639 UTC DEBUG [RestInitiatorClient1] 27532 sendToClient finished 


In FIXEdge.log

2019-10-24 06:46:21,631 UTC ERROR [RestOutTA] 27532 Error in sendToClient: Client 'RestInitiatorClient1' could not send POST request to the server (2) 'jsonplaceholder.typicodes.com'. Reason: Host not found: jsonplaceholder.typicodes.com. 


Solution 

Possible reason is the wrong host. Check the host is available (ping  <ServerHost> ). If the host is available contact Support, otherwise correct TransportLayer.RestOutTA.ServerHostparameter value in adapter configuration. 

Send to Client failed 

Description 

Message is not sent, adapter is initiated correctly, user gets error in REST TA log file: 

2019-10-24 07:17:05,706 UTC DEBUG [RestInitiatorClient1] 24408 sendToClient started 
2019-10-24 07:17:05,706 UTC DEBUG [RestInitiatorClient1] 24408 sendRequest attempt 1 of 2 
2019-10-24 07:17:06,146 UTC ERROR [RestInitiatorClient1] 24408 REST server returned an error response status: 404 
2019-10-24 07:17:06,146 UTC WARN [RestInitiatorClient1] 24408 sendToClient failed. Sending message reject. 
2019-10-24 07:17:06,146 UTC DEBUG [RestInitiatorClient1] 24408 sendToClient finished

Solution 

A possible reason is wrong URI. If the URI value is correct contact Support, otherwise correct the TransportLayer.RestOutTA.URIparameter value in adapter configuration. 

Validation error 

Description 

User gets validation error, but message is sent successfully: 

2019-10-24 08:19:25,663 UTC DEBUG [RestInitiatorClient1] 31516 sendToClient started 
2019-10-24 08:19:25,663 UTC WARN [RestInitiatorClient1] 31516 FIX validation error: Field value 'FUT' does not meet ValBlock dictionary conditions in tag SecurityType (167) in message Execution Report (8) with sequence number 3. 
2019-10-24 08:19:25,663 UTC DEBUG [RestInitiatorClient1] 31516 sendRequest attempt 1 of 2 
2019-10-24 08:19:26,108 UTC TRACE [RestInitiatorClient1] 31516 Message sent successfully. 
2019-10-24 08:19:26,108 UTC DEBUG [RestInitiatorClient1] 31516 sendToClient finished 

User gets validation error, message is rejected: 

2019-10-24 08:22:27,526 UTC DEBUG [RestInitiatorClient1] 34024 sendToClient started 
2019-10-24 08:22:27,526 UTC WARN [RestInitiatorClient1] 34024 FIX validation error: Field value 'FUT' does not meet ValBlock dictionary conditions in tag SecurityType (167) in message Execution Report (8) with sequence number 2. 
2019-10-24 08:22:27,526 UTC WARN [RestInitiatorClient1] 34024 sendToClient failed. Sending message reject. 
2019-10-24 08:22:27,526 UTC DEBUG [RestInitiatorClient1] 34024 sendToClient finished 

Solution 

Validation error means that FIX message has incorect tag values of message structure. In the first case message is sent successfully because ValidateFIXMessage = ValidateAndWarn is set up. In the second case message is rejected because ValidateFIXMessage = ValidateAndReject is set up. Possible actions: 

  • correct message 
  • update dictionary 
  • turn off validation: TransportLayer.RestOutTA.ValidateFIXMessage = No). 

Wrong security options 

Description 

Message is not sent, adapter is initiated correctly, user gets error in log: 

2019-10-24 08:36:44,231 UTC DEBUG [RestInitiatorClient1] 22820 sendToClient started 
2019-10-24 08:36:44,232 UTC DEBUG [RestInitiatorClient1] 22820 sendRequest attempt 1 of 2 
2019-10-24 08:36:44,436 UTC ERROR [RestInitiatorClient1] 22820 Client 'RestInitiatorClient1' could not send POST request to the server (2) 'jsonplaceholder.typicode.com'. Reason: SSL Exception: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol. 
2019-10-24 08:36:44,436 UTC DEBUG [RestInitiatorClient1] 22820 sendRequest attempt 2 of 2 
2019-10-24 08:36:44,561 UTC ERROR [RestInitiatorClient1] 22820 Client 'RestInitiatorClient1' could not send POST request to the server (2) 'jsonplaceholder.typicode.com'. Reason: SSL Exception: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol. 
2019-10-24 08:36:44,561 UTC WARN [RestInitiatorClient1] 22820 sendToClient failed. Sending message reject. 
2019-10-24 08:36:44,561 UTC DEBUG [RestInitiatorClient1] 22820 sendToClient finished 

or: 

019-10-30 06:23:10,941 UTC DEBUG [RestInitiatorClient1] 24840 Setting up HTTP session with jsonplaceholder.typicode.com:443 endpoint 
2019-10-30 06:23:10,941 UTC DEBUG [RestInitiatorClient1] 24840 Timeout for client 'RestInitiatorClient1' = 60. 
2019-10-30 06:23:10,941 UTC INFO [RestInitiatorClient1] 24840 REST Initiator TA v.0.0.0.1 started. 
2019-10-30 06:23:25,490 UTC DEBUG [RestInitiatorClient1] 27036 sendToClient started 
2019-10-30 06:23:25,490 UTC DEBUG [RestInitiatorClient1] 27036 sendRequest attempt 1 of 2 
2019-10-30 06:23:25,660 UTC ERROR [RestInitiatorClient1] 27036 REST server returned an error response status: 400 
2019-10-30 06:23:25,660 UTC WARN [RestInitiatorClient1] 27036 sendToClient failed. Sending message reject. 
2019-10-30 06:23:25,660 UTC DEBUG [RestInitiatorClient1] 27036 sendToClient finished 

Solution 

A possible reason is security parameters are not correct - do not correspond to destination system connection properties. Try to change  TransportLayer.RestOutTA.Protocol or TransportLayer.RestOutTA.ServerPort parameters. 

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