8380549: HttpCookie.expiryDate2DeltaSeconds returns 0 on parse failure, causing immediate cookie expiration

[ehs208]

When expiryDate2DeltaSeconds() fails to parse the Expires attribute against all date formats, it returns 0. The caller in assignMaxAgeAttribute() then sets maxAge=0, which causes hasExpired() to return true. Per RFC 6265 section 5.2.1, an unparseable Expires value should be ignored, leaving maxAge=-1 (session cookie).

This fix introduces a sentinel constant (Long.MIN_VALUE) as the return value for parse failure, since 0 is a valid delta for dates that match the creation time. The caller checks for this sentinel and skips the maxAge assignment when parsing fails.

A new test in MaxAgeExpires verifies that unparseable Expires values are correctly ignored.

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issue

• JDK-8380549: HttpCookie.expiryDate2DeltaSeconds returns 0 on parse failure, causing immediate cookie expiration (Bug - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk.git pull/30341/head:pull/30341
$ git checkout pull/30341

Update a local copy of the PR:
$ git checkout pull/30341
$ git pull https://git.openjdk.org/jdk.git pull/30341/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 30341

View PR using the GUI difftool:
$ git pr show -t 30341

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk/pull/30341.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back ehs208! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

@ehs208 The following label will be automatically applied to this pull request:

• net

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

[mlbridge]

Webrevs

• 00: Full (bd9a80e6)