Oracle PL/SQL HTTP request response encoding issue - oracle

Question

Following my previous question, I don't seem to be able to convert a HTTP response from ISO-8859-1 to UTF-8.
I am using APEX_WEB_SERVICE package to to my requests. (I know this package uses UTL_HTTP itself, so it should be similar in usage)
What I do:
apex_web_service.g_request_headers(1).name := 'Content-Type';
apex_web_service.g_request_headers(1).value := 'text/csv';
l_response := apex_web_service.make_rest_request(
p_url => MY_URL || '/download_csv',
p_http_method => 'GET'
);
l_response contains the csv data but all 'é' and 'è' are replaced by '¿':
Type;Groupe Acc¿Code;EOTP autoris¿Familles EOTP autoris¿;Nom;Pr¿m;Adresse
Whereas if I access the link directly, my browser downloads it with proper encoding:
Type;Groupe Accès;Code;EOTP autorisés;Familles EOTP autorisées;Nom;Prénom;Adresse
I tried to convert the response with:
l_response := convert(l_response, 'AL16UTF16', 'WE8ISO8859P1');
But it has absolutely no effect.
The website is https://www.stocknet.fr/ and is in ISO-8859-1.
My Oracle NLS parameters (which I obviously can't modify):
+-------------------------+-----------------------------+
| PARAMETER | VALUE |
+-------------------------+-----------------------------+
| NLS_LANGUAGE | ENGLISH |
| NLS_TERRITORY | UNITED KINGDOM |
| NLS_CURRENCY | £ |
| NLS_ISO_CURRENCY | UNITED KINGDOM |
| NLS_NUMERIC_CHARACTERS | ., |
| NLS_CALENDAR | GREGORIAN |
| NLS_DATE_FORMAT | DD-MON-RR HH24:MI |
| NLS_DATE_LANGUAGE | ENGLISH |
| NLS_CHARACTERSET | WE8MSWIN1252 |
| NLS_SORT | BINARY |
| NLS_TIME_FORMAT | HH24.MI.SSXFF |
| NLS_TIMESTAMP_FORMAT | DD-MON-RR HH24.MI.SSXFF |
| NLS_TIME_TZ_FORMAT | HH24.MI.SSXFF TZR |
| NLS_TIMESTAMP_TZ_FORMAT | DD-MON-RR HH24.MI.SSXFF TZR |
| NLS_DUAL_CURRENCY | € |
| NLS_NCHAR_CHARACTERSET | AL16UTF16 |
| NLS_COMP | BINARY |
| NLS_LENGTH_SEMANTICS | BYTE |
| NLS_NCHAR_CONV_EXCP | FALSE |
+-------------------------+-----------------------------+
At this point, I don't know if there is any way to process data from this website from plsql. Any help, tips or suggestion would be appreciated.

Answer 1

Turns out I had to use UTL_HTTP and DBMS_LOB in order for Oracle to parse correctly the characters.
This solved my issue:
DECLARE
l_clob CLOB;
l_http_request utl_http.req;
l_http_response utl_http.resp;
l_text VARCHAR2(32767);
BEGIN
dbms_lob.createtemporary(l_clob, false);
l_http_request := utl_http.begin_request(my_url || '/download_csv');
l_http_response := utl_http.get_response(l_http_request);
BEGIN
LOOP
utl_http.read_text(l_http_response, l_text, 32766);
dbms_lob.writeappend(l_clob, length(l_text), l_text);
END LOOP;
EXCEPTION
WHEN utl_http.end_of_body THEN
utl_http.end_response(l_http_response);
END;
dbms_output.put_line(l_clob); /* => ENCODING IS FINALLY GOOD ! */
dbms_lob.freetemporary(l_blob);
EXCEPTION
WHEN OTHERS THEN
utl_http.end_response(l_http_response);
dbms_lob.freetemporary(l_blob);
RAISE;
END;
/
I hope this could help someone else.