Fetch request concatenates Cookie headers with comma instead of semicolon #1905
Description
Version
19.6.0
Platform
Darwin MBP.local 22.2.0 Darwin Kernel Version 22.2.0: Fri Nov 11 02:08:47 PST 2022; root:xnu-8792.61.2~4/RELEASE_X86_64 x86_64
Subsystem
No response
What steps will reproduce the bug?
When specifying multiple Cookie headers for a fetch request, the headers will be concatenated using commas instead of semicolons. While this is technically compliant with the WHATWG spec, that spec is based around browser use and causes a risk of incorrect handling by the receiving server.
Example:
fetch('http://localhost:8080/', {
headers: [
['cookie', 'FOO=lorem-ipsum-dolor-sit-amet'],
['cookie', 'BAR=the-quick-brown-fox']
]
});How often does it reproduce? Is there a required condition?
No response
What is the expected behavior?
Cookies are separated by semicolons (;).
GET / HTTP/1.1
host: localhost:8080
connection: keep-alive
cookie: FOO=lorem-ipsum-dolor-sit-amet; BAR=the-quick-brown-fox
...What do you see instead?
Cookies are separated by commas (,).
GET / HTTP/1.1
host: localhost:8080
connection: keep-alive
cookie: FOO=lorem-ipsum-dolor-sit-amet, BAR=the-quick-brown-fox
...Additional information
Similar issue but on the receiving end: nodejs/node#11256