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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU Affero General Public License is a free, copyleft license for
+software and other kinds of works, specifically designed to ensure
+cooperation with the community in the case of network server software.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+our General Public Licenses are intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.
+
+  When we speak of free software, we are referring to freedom, not
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+
+  Developers that use our General Public Licenses protect your rights
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+  A secondary benefit of defending all users' freedom is that
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+The GNU General Public License permits making a modified version and
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+code of the modified version.
+
+  An older license, called the Affero General Public License and
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+released a new version of the Affero GPL which permits relicensing under
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+  The precise terms and conditions for copying, distribution and
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+
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+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<https://www.gnu.org/licenses/>.
diff --git a/src/fead.py b/src/fead.py
new file mode 100755
index 0000000..d9b94a3
--- /dev/null
+++ b/src/fead.py
@@ -0,0 +1,152 @@
+#!/usr/bin/env python3
+# Format mbox as HTML/XML
+# Copyright (C) 2021-2022  Nguyễn Gia Phong
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+from asyncio import gather, open_connection, run
+from collections import namedtuple
+from datetime import datetime
+from email.utils import parsedate_to_datetime
+from http.client import HTTPResponse
+from io import BytesIO
+from sys import stdin
+from urllib.error import HTTPError
+from urllib.parse import urljoin, urlsplit
+from xml.etree.ElementTree import fromstring as parse_xml
+
+REQUEST = 'GET {} HTTP/1.0\r\nHost: {}\r\n\r\n'
+Feed = namedtuple('Feed', ('title', 'items'))
+Item = namedtuple('Item', ('title', 'link', 'date', 'description'))
+
+
+class BytesSocket:
+    """Duck socket for HTTPResponse."""
+    def __init__(self, response):
+        self.bytes = response
+
+    def makefile(self, mode, *args, **kwargs):
+        """Return a bytes stream."""
+        assert mode == 'rb'
+        return BytesIO(self.bytes)
+
+
+def parse_rss_item(xml):
+    """Parse given RSS item."""
+    date = None
+    description = ''
+    for child in xml:
+        if child.tag == 'title':
+            title = child.text
+        elif child.tag == 'link':
+            link = child.text
+        elif child.tag == 'pubDate':
+            date = parsedate_to_datetime(child.text)
+        elif child.tag == 'description':
+            description = child.text
+        elif child.tag == 'content:encoded' and not description:
+            description = child.text
+    if not description:
+        description = xml.text
+    return Item(title, link, date, description)
+
+
+def parse_rss(xml, url):
+    """Parse given RSS feed."""
+    title = url
+    items = []
+    for child in xml:
+        if child.tag == 'title':
+            title = child.text
+        elif child.tag == 'item':
+            items.append(parse_rss_item(child))
+    return Feed(title, items)
+
+
+def parse_atom_entry(xml):
+    """Parse given Atom entry."""
+    date = None
+    summary = ''
+    for child in xml:
+        if child.tag.endswith('Atom}title'):
+            title = child.text
+        elif child.tag.endswith('Atom}link'):
+            link = child.attrib['href']
+        elif child.tag.endswith('Atom}published'):
+            date = datetime.fromisoformat(child.text.replace('Z', '+00:00'))
+        elif child.tag.endswith('Atom}summary'):
+            summary = child.text
+        elif child.tag.endswith('Atom}content') and not summary:
+            summary = child.text
+    return Item(title, link, date, summary)
+
+
+def parse_atom(xml, url):
+    """Parse given Atom feed."""
+    title = url
+    entries = []
+    for child in xml:
+        if child.tag.endswith('Atom}title'):
+            title = child.text
+        elif child.tag.endswith('Atom}entry'):
+            entries.append(parse_atom_entry(child))
+    return Feed(title, entries)
+
+
+async def fetch(url):
+    """Fetch web feed from given URL and return it parsed."""
+    if url.scheme == 'https':
+        reader, writer = await open_connection(url.hostname, 443, ssl=True)
+    elif url.scheme == 'http':
+        reader, writer = await open_connection(url.hostname, 80)
+    else:
+        raise ValueError(f'unsupported URL scheme: {url.scheme}')
+    writer.write(REQUEST.format(url.path or '/', url.hostname).encode())
+    response = HTTPResponse(BytesSocket(await reader.read()))
+    writer.close()
+
+    response.begin()
+    with response:
+        if response.status >= 400:
+            raise HTTPError(url.geturl(), response.status, response.reason,
+                            response.getheaders(), response)
+        if response.status >= 300:
+            location = urljoin(url.geturl(), response.getheader('Location'))
+            print(url.geturl(), '->', location)
+            return await fetch(urlsplit(location))
+        if response.status >= 200:
+            xml = parse_xml(response.read())
+            if xml.tag == 'rss':
+                assert xml[0].tag == 'channel'
+                return parse_rss(xml[0], url.hostname)
+            if xml.tag.endswith('Atom}feed'):
+                return parse_atom(xml, url.hostname)
+            raise ValueError(f'unsupported feed format at {url.geturl()}')
+        # FIXME: handle informational responses
+
+
+async def fetch_all(urls):
+    """Fetch all given URLs asynchronously and return them parsed."""
+    tasks = gather(*(fetch(urlsplit(url)) for url in urls))
+    try:
+        return await tasks
+    except:
+        tasks.cancel()
+        raise
+
+
+if __name__ == '__main__':
+    feeds = run(fetch_all(stdin.readlines()))
+    for feed in feeds:
+        print(feed)