<![CDATA[Opera 49 creates invalid mhtml file]]>Opera 49 creates invalid mhtml file. Header may have the following structure:

From: <Saved by Blink>
X-Snapshot-Version: 1.0
X-Snapshot-Title: =?utf-8?Q?=D0=AF=D0=BD=D0=B4=D0=B5=D0=BA=D1=81.=D0=9D=D0=BE=D0=B2=D0=BE=D1=81=D1=82=
=D0=B8: =D0=93=D0=BB=D0=B0=D0=B2=D0=BD=D1=8B=D0=B5 =D0=BD=D0=BE=D0=B2=D0=BE=
=D1=81=D1=82=D0=B8 =D1=81=D0=B5=D0=B3=D0=BE=D0=B4=D0=BD=D1=8F, =D1=81=D0=B0=
=D0=BC=D1=8B=D0=B5 =D1=81=D0=B2=D0=B5=D0=B6=D0=B8=D0=B5 =D0=B8 =D0=BF=D0=BE=
=D1=81=D0=BB=D0=B5=D0=B4=D0=BD=D0=B8=D0=B5 =D0=BD=D0=BE=D0=B2=D0=BE=D1=81=
=D1=82=D0=B8 =D0=A0=D0=BE=D1=81=D1=81=D0=B8=D0=B8 =D0=BE=D0=BD=D0=BB=D0=B0=
=D0=B9=D0=BD?=
X-Snapshot-Content-Location: https://news.yandex.ru/

As you see content of X-Snapshot-Title is encoded with RFC 2047 but there are no leading spaces at the beginning of every new line of encoded string.

RFC 2047 says: An 'encoded-word' may not be more than 75 characters long, including 'charset', 'encoding', 'encoded-text', and delimiters. If it is desirable to encode more text than will fit in an 'encoded-word' of 75 characters, multiple 'encoded-word's (separated by CRLF SPACE) may be used.

So existing mime parsers cannot correctly parse such files. Is it possible to fix algorithm of mhtml file creation?

]]>https://forums.opera.com/topic/23875/opera-49-creates-invalid-mhtml-fileRSS for NodeSun, 19 Jul 2026 23:23:19 GMTMon, 11 Dec 2017 22:58:26 GMT60<![CDATA[Reply to Opera 49 creates invalid mhtml file on Thu, 14 Dec 2017 03:39:27 GMT]]>Confirmed. It's missing the spaces. Happens in Chrome too, so this needs to be filed at https://bugs.chromium.org/p/chromium/issues/list.

And, just for comparison, here's what a few mail clients do with the title on news.yandex.ru:

Opera Mail:

Subject: =?utf-8?B?U3ViamVjdDog0K/QvdC00LXQutGBLtCd0L7QstC+0YHRgtC4OiDQk9C70LA=?=
 =?utf-8?B?0LLQvdGL0LUg0L3QvtCy0L7RgdGC0Lgg0YHQtdCz0L7QtNC90Y8sINGB0LA=?=
 =?utf-8?B?0LzRi9C1INGB0LLQtdC20LjQtSDQuCDQv9C+0YHQu9C10LTQvdC40LUg0L0=?=
 =?utf-8?B?0L7QstC+0YHRgtC4INCg0L7RgdGB0LjQuCDQvtC90LvQsNC50L0=?=

Thunderbird:

Subject: =?UTF-8?B?0K/QvdC00LXQutGBLtCd0L7QstC+0YHRgtC4OiDQk9C70LDQstC90Ys=?=
 =?UTF-8?B?0LUg0L3QvtCy0L7RgdGC0Lgg0YHQtdCz0L7QtNC90Y8sINGB0LDQvNGL0LUg0YE=?=
 =?UTF-8?B?0LLQtdC20LjQtSDQuCDQv9C+0YHQu9C10LTQvdC40LUg0L3QvtCy0L7RgdGC0Lgg?=
 =?UTF-8?B?0KDQvtGB0YHQuNC4INC+0L3Qu9Cw0LnQvQ==?=

mail.google.com:

Subject: =?UTF-8?B?0K/QvdC00LXQutGBLtCd0L7QstC+0YHRgtC4OiDQk9C70LDQstC90YvQtSDQvdC+0LLQvg==?=
    =?UTF-8?B?0YHRgtC4INGB0LXQs9C+0LTQvdGPLCDRgdCw0LzRi9C1INGB0LLQtdC20LjQtSDQuCDQv9C+0YHQu9C1?=
    =?UTF-8?B?0LTQvdC40LUg0L3QvtCy0L7RgdGC0Lgg0KDQvtGB0YHQuNC4INC+0L3Qu9Cw0LnQvQ==?=

They're not using quoted-printable, but no matter. They're using spaces (or tabs in the mail.google.com) for line continuation.

]]>https://forums.opera.com/post/134383https://forums.opera.com/post/134383Thu, 14 Dec 2017 03:39:27 GMT<![CDATA[Reply to Opera 49 creates invalid mhtml file on Wed, 13 Dec 2017 20:53:12 GMT]]>MHTML Generation and Loading. As implemented in Chrome.
Authors: jianli@chromium.org
Last Updated: Nov 21, 2017

Qouted
Note: the long title line can be split into multiple lines using soft line break “CRLF+SPACE/TAB” per RFC 2047. The soft line break “=CRLF” used to break long line in message body as defined in RFC 2045 should NOT be used.
Qouted

]]>https://forums.opera.com/post/134370https://forums.opera.com/post/134370Wed, 13 Dec 2017 20:53:12 GMT