Using CL_HTTP_CLIENT object to send HTTP request - GB2312 encoding

[Former Member]

Hello!

I have to create a program that sends an xml string via HTTP to a bank server to get encoded. The bank server then sends me the encoded data back.

I am trying to implement this using the CL_HTTP_CLIENT object, but it does not appear to be sending chinese characters correctly. (There will always be Chinese characters in the xml body string I am sending)

I am using the following code to build and execute the POST (please note, the content type is not standard - I'm not sure if this matters or not).

After my code executes, I am able to check a log file that is generated by the bank - and apparently my request is always being send as "utf-8" encoding. This causes the chinese characters to be read incorrectly by the bank.

Is there anything special I need to do to be able to send "gb2312" charset with my HTTP post?? Please help... I will greatly appreciate it!

My current code to send the request (after the code, i'll show you what the bank is saying it received):

Create the HTTP client object

CALL METHOD CL_HTTP_CLIENT=>CREATE_BY_URL

EXPORTING

URL = url_string

IMPORTING

CLIENT = HTTP_CLIENT_XML

EXCEPTIONS

ARGUMENT_NOT_FOUND = 1

INTERNAL_ERROR = 2

PLUGIN_NOT_ACTIVE = 3

OTHERS = 4.

• Error checking

IF SY-SUBRC <> 0.

ENDIF.

• Set HTTP header properites

• Set REQUEST METHOD

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_HEADER_FIELD

EXPORTING

NAME = '~request_method'

VALUE = 'POST'.

• Set SERVER PROTOCOL

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_HEADER_FIELD

EXPORTING

NAME = '~server_protocol'

VALUE = 'HTTP/1.0'.

• Set CONTENT-TYPE

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_HEADER_FIELD

EXPORTING

NAME = 'Content-Type'

VALUE = 'INFOSEC_SIGN/1.0; charset=GB2312'.

• end of HTTP header properites

• set my XML string as the CDATA

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_CDATA

EXPORTING

DATA = big_xml

OFFSET = 0

LENGTH = xml_length.

******************************************

• Send the HTTP request

CALL METHOD HTTP_CLIENT_XML->SEND

• EXPORTING

• timeout =

EXCEPTIONS

HTTP_COMMUNICATION_FAILURE = 1

HTTP_INVALID_STATE = 2

HTTP_PROCESSING_FAILED = 3

OTHERS = 4.

• Error checking

IF SY-SUBRC <> 0.

CALL METHOD HTTP_CLIENT_XML->GET_LAST_ERROR

IMPORTING

CODE = SUBRC

MESSAGE = ERRORTEXT.

ENDIF.

• Receive HTTP response

CALL METHOD HTTP_CLIENT_XML->RECEIVE

EXCEPTIONS

HTTP_COMMUNICATION_FAILURE = 1

HTTP_INVALID_STATE = 2

HTTP_PROCESSING_FAILED = 3

OTHERS = 4.

• Error checking

IF SY-SUBRC <> 0.

CALL METHOD HTTP_CLIENT_XML->GET_LAST_ERROR

IMPORTING

CODE = SUBRC

MESSAGE = ERRORTEXT.

ERRORTEXT.

ENDIF.

This code works, but the bank server isn't interpreting the chinese characters correctly...

When the bank gets the POST, this is the header it receives from my program:

POST / HTTP/1.0

content-type: INFOSEC_SIGN/1.0; charset=utf-8

content-length: 1501

user-agent: SAP Web Application Server (1.0;700)

host: 192.168.44.203:449

accept-encoding: gzip

This all looks correct, except for the "charset-utf-8" it appended to the header. How do I get rid of this? I do not want to send the HTTP post request as utf-8 because of the chinese characters!

See my code... I assign my content type like this, but it has not worked - it ignores my "gb2312" and puts the utf-8 back in the header:

• Set CONTENT-TYPE

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_HEADER_FIELD

EXPORTING

NAME = 'Content-Type'

VALUE = 'INFOSEC_SIGN/1.0; charset=GB2312'.

Any ideas?

[Former Member]

I'm sorry for the formatting above! I typed everything in paragraphs very neatly, but it does not show that way in my original post.

[Former Member]

(Apparently the code I copied and pasted into the post caused my formatting issue - here is the post without the code)

I have to create a program that sends an xml string via HTTP to a bank server to get encoded. The bank server then sends me the encoded data back.

I am trying to implement this using the CL_HTTP_CLIENT object, but it does not appear to be sending chinese characters correctly. (There will always be Chinese characters in the xml body string I am sending)

I am using the following code to build and execute the POST (please note, the content type is not standard - I'm not sure if this matters or not).

After my code executes, I am able to check a log file that is generated by the bank - and apparently my request is always being send as "utf-8" encoding. This causes the chinese characters to be read incorrectly by the bank.

Is there anything special I need to do to be able to send "gb2312" charset with my HTTP post?? Please help... I will greatly appreciate it!

My current code to send the request (after the code, i'll show you what the bank is saying it received):

Any ideas?

Edited by: Matt Sprague on Sep 18, 2009 2:35 PM

Edited by: Matt Sprague on Sep 18, 2009 2:37 PM

[Former Member]

OK - here is the code - should be formatted ok now. Sorry for that!

• Create the HTTP client object

CALL METHOD CL_HTTP_CLIENT=>CREATE_BY_URL

EXPORTING

URL = url_string

IMPORTING

CLIENT = HTTP_CLIENT_XML

EXCEPTIONS

ARGUMENT_NOT_FOUND = 1

INTERNAL_ERROR = 2

PLUGIN_NOT_ACTIVE = 3

OTHERS = 4.

• Error checking

IF SY-SUBRC <> 0.

ENDIF.

• Set HTTP header properites

• Set REQUEST METHOD

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_HEADER_FIELD

EXPORTING

NAME = '~request_method'

VALUE = 'POST'.

• Set SERVER PROTOCOL

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_HEADER_FIELD

EXPORTING

NAME = '~server_protocol'

VALUE = 'HTTP/1.0'.

• Set CONTENT-TYPE

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_HEADER_FIELD

EXPORTING

NAME = 'Content-Type'

VALUE = 'INFOSEC_SIGN/1.0; charset=GB2312'.

***********************************************

CALL METHOD HTTP_CLIENT_XML->REQUEST->SET_CDATA

EXPORTING

DATA = big_xml

OFFSET = 0

LENGTH = xml_length.

• Send the HTTP request

CALL METHOD HTTP_CLIENT_XML->SEND

• EXPORTING

• timeout =

EXCEPTIONS

HTTP_COMMUNICATION_FAILURE = 1

HTTP_INVALID_STATE = 2

HTTP_PROCESSING_FAILED = 3

OTHERS = 4.

• Error checking

IF SY-SUBRC <> 0.

CALL METHOD HTTP_CLIENT_XML->GET_LAST_ERROR

IMPORTING

CODE = SUBRC

MESSAGE = ERRORTEXT.

ENDIF.

• Receive HTTP response

CALL METHOD HTTP_CLIENT_XML->RECEIVE

EXCEPTIONS

HTTP_COMMUNICATION_FAILURE = 1

HTTP_INVALID_STATE = 2

HTTP_PROCESSING_FAILED = 3

OTHERS = 4.

• Error checking

IF SY-SUBRC <> 0.

CALL METHOD HTTP_CLIENT_XML->GET_LAST_ERROR

IMPORTING

CODE = SUBRC

MESSAGE = ERRORTEXT.

ENDIF.

• Move response string into variable

• RESULT = HTTP_CLIENT_XML->RESPONSE->GET_CDATA( ).

• Close HTTP connection

CALL METHOD HTTP_CLIENT_XML->CLOSE

EXCEPTIONS

HTTP_INVALID_STATE = 1

OTHERS = 2.

• Error checking

IF SY-SUBRC <> 0.

CALL METHOD HTTP_CLIENT_XML->GET_LAST_ERROR

IMPORTING

CODE = SUBRC

MESSAGE = ERRORTEXT.

ENDIF.

[Former Member]

This is the header the bank is saying I am sending - note how it puts UTF-8 into it automatically!

POST / HTTP/1.0

content-type: INFOSEC_SIGN/1.0; charset=utf-8

content-length: 1501

user-agent: SAP Web Application Server (1.0;700)

host: 192.168.44.203:449

accept-encoding: gzip

[Former Member]

I solved the issue:

If I assign the xml to the request using the HTTP_CLIENT_XML->REQUEST->SET_CDATA method it seems to always assign UTF-8 as the encoding scheme.

If I convert my xml string to a '8400' encoded byte string, and assign it to the request with the HTTP_CLIENT_XML->REQUEST->SET_DATA method it transmits the data correctly and the UTF-8 encoding is NOT used.