Bump waitress from 1.3.1 to 1.4.1

[dependabot]

Bumps waitress from 1.3.1 to 1.4.1.

Changelog

Sourced from waitress's changelog.

1.4.1 (2019-12-24)

Security Fixes

- Waitress did not properly validate that the HTTP headers it received were
  properly formed, thereby potentially allowing a front-end server to treat a
  request different from Waitress. This could lead to HTTP request
  smuggling/splitting.

  Please see the security advisory for more information:
  https://github.com/Pylons/waitress/security/advisories/GHSA-m5ff-3wj3-8ph4

1.4.0 (2019-12-20)
------------------

Bugfixes
~~~~~~~~

- Waitress used to slam the door shut on HTTP pipelined requests without
  setting the ``Connection: close`` header as appropriate in the response. This
  is of course not very friendly. Waitress now explicitly sets the header when
  responding with an internally generated error such as 400 Bad Request or 500
  Internal Server Error to notify the remote client that it will be closing the
  connection after the response is sent.

- Waitress no longer allows any spaces to exist between the header field-name
  and the colon. While waitress did not strip the space and thereby was not
  vulnerable to any potential header field-name confusion, it should have sent
  back a 400 Bad Request. See [Pylons/waitress#273](https://github-redirect.dependabot.com/Pylons/waitress/issues/273)

Security Fixes

• Waitress implemented a "MAY" part of the RFC7230
  (https://tools.ietf.org/html/rfc7230#section-3.5) which states:

  Although the line terminator for the start-line and header fields is
  the sequence CRLF, a recipient MAY recognize a single LF as a line
  terminator and ignore any preceding CR.
  

  Unfortunately if a front-end server does not parse header fields with an LF
  the same way as it does those with a CRLF it can lead to the front-end and
  the back-end server parsing the same HTTP message in two different ways. This
  can lead to a potential for HTTP request smuggling/splitting whereby Waitress
  may see two requests while the front-end server only sees a single HTTP
  message.

  For more information I can highly recommend the blog post by ZeddYu Lu

... (truncated)

Commits

• cd83598 Prep v1.4.1
• 11d9e13 Merge pull request from GHSA-m5ff-3wj3-8ph4
• a046a76 Add links to advisories for previous security issues
• 3c58e39 Bump version number
• de3324d Add documentation for security issue
• 3bcd690 Define VCHAR/OBS_TEXT once
• 2e46f24 Validate HTTP header-field more completely
• 2a11d68 Add file with RFC7230 definitions/ABNF -> regex
• f11093a Merge pull request from GHSA-g2xc-35jw-c63p
• e586be8 Version 1.4.0
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot ignore this [patch|minor|major] version will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
• @dependabot use these labels will set the current labels as the default for future PRs for this repo and language
• @dependabot use these reviewers will set the current reviewers as the default for future PRs for this repo and language
• @dependabot use these assignees will set the current assignees as the default for future PRs for this repo and language
• @dependabot use this milestone will set the current milestone as the default for future PRs for this repo and language

You can disable automated security fix PRs for this repo from the Security Alerts page.

[dependabot]

Superseded by #755.