# SSL(0A000126) : unexpected eof while opening many web sites with http\_open

**URL:** <https://swi-prolog.discourse.group/t/ssl-0a000126-unexpected-eof-while-opening-many-web-sites-with-http-open/7145>\
**Category:** General\
**Created:** [January 3, 2024, 3:07pm UTC](https://swi-prolog.discourse.group/t/ssl-0a000126-unexpected-eof-while-opening-many-web-sites-with-http-open/7145 "2024-01-03T15:07:34Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![matteoredaelli](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/matteoredaelli/32/948_2.png) [@matteoredaelli](https://swi-prolog.discourse.group/u/matteoredaelli)\
**Post date:** [January 3, 2024, 3:07pm UTC](https://swi-prolog.discourse.group/t/ssl-0a000126-unexpected-eof-while-opening-many-web-sites-with-http-open/7145/1 "2024-01-03T15:07:34Z")

</div>

Hello

Opening many web sites (like twitter.con, [pirellihangarbicocca.org](http://pirellihangarbicocca.org), …) using

```prolog
  Url="https://twitter.com/", http_open(Url, In, [cert_verify_hook(cert_accept_any)]), load_html(In, DOM, []),close(In).

```

I get

```prolog
ERROR: SSL(0A000126) : unexpected eof while reading
ERROR: In:
ERROR: [19] sgml:sgml_parse(sgml_parser(94669959974976),[document(...),...|...])
ERROR: [17] setup_call_catcher_cleanup(sgml:new_sgml_parser(...,...),sgml:parse(...,...,...,<stream>(0x561a11520a00,0x561a1124c000)),_110940,sgml:free_sgml_parser(...)) at /usr/lib/swi-prolog/boot/init.pl:679
ERROR: [15] sgml:load_structure_from_stream(<stream>(0x561a11520a00,0x561a1124c000),_111012,user:[...|...]) at /usr/lib/swi-prolog/library/sgml.pl:429
ERROR: [14] setup_call_catcher_cleanup(sgml:open_any(<stream>(0x561a11520a00,0x561a1124c000),read,<stream>(0x561a11520a00,0x561a1124c000),true,...),sgml:load_structure_from_stream(<stream>(0x561a11520a00,0x561a1124c000),_111086,...),_111054,sgml:close_any(true)) at /usr/lib/swi-prolog/boot/init.pl:679
ERROR: [10] '<meta-call>'('<garbage_collected>') <foreign>
ERROR: [9] toplevel_call('<garbage_collected>') at /usr/lib/swi-prolog/boot/toplevel.pl:1173
ERROR: 
ERROR: Note: some frames are missing due to last-call optimization.
ERROR: Re-run your program in debug mode (:- debug.) to get more detail.
^ Exception: (17) setup_call_catcher_cleanup(sgml:new_sgml_parser(sgml_parser(94669959974976), [dtd(dtd(94669959093424, html5))]), sgml:parse(sgml_parser(94669959974976), user:[dialect(html5), dialet(html), max_errors(-1), syntax_errors(quiet)], _39290, <stream>(0x561a11520a00,0x561a1124c000)), _155658, sgml:free_sgml_parser(sgml_parser(94669959974976))) ? creep
   Call: (19) sgml:free_sgml_parser(sgml_parser(94669959974976)) ? 

```

I suppose it is related to SSL , but I can get the url with curl, the browser and other programming languages.

My env is

```prolog
matteo@debian:~$ openssl version
OpenSSL 3.1.4 24 Oct 2023 (Library: OpenSSL 3.1.4 24 Oct 2023)

matteo@debian:~$ swipl --version
SWI-Prolog version 9.0.4 for x86_64-linux

matteo@debian:~$ uname -a
Linux debian 6.5.0-5-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.5.13-1 (2023-11-29) x86_64 GNU/Linux

```

Reading some blog posts I also tried to set th option “SSL\_OP\_IGNORE\_UNEXPECTED\_EOF” in /etc/ssl/openssl.cnf but running the prolog code I get out of memory / cannot allocate memory…

Thanks in advance  
Matteo

---

<div class="post-metadata">

**Author:** ![CapelliC](https://yyz2.discourse-cdn.com/free1/user_avatar/swi-prolog.discourse.group/capellic/32/17_2.png) [@CapelliC](https://swi-prolog.discourse.group/u/CapelliC)\
**Post date:** [January 4, 2024, 5:44am UTC](https://swi-prolog.discourse.group/t/ssl-0a000126-unexpected-eof-while-opening-many-web-sites-with-http-open/7145/2 "2024-01-04T05:44:33Z")

</div>

I’m running version 9.1.21 (nightly in Win11, built from source in Ubuntu:WSL), and cannot reproduce your problem.

Indeed, apart the fact that [https://twitter.com](https://twitter.com) is unreachable (being redirected to [x.com](http://x.com) ? that in turn appears to redirect back to [twitter.com](http://twitter.com) ?), load\_html/3 succeeds.

Maybe you should first try to upgrade your swipl version…