通常情况下，一个浏览器的cookie组成一个单一Cookie报头，如：
Cookie: a=1; b=2
是否标准允许把这些作为单独的标题，比如：
Cookie: a=1
Cookie: b=2
还是他们总是要在同一行？
Answer 1:
在此页面偶然而寻找的话题的详细信息。 从A报价HTTP State Management Mechanism ， RFC 6265应该让事情更清晰：
5.4。 小甜饼报头
当用户代理产生一个HTTP请求，用户代理必须不附着多个cookie头字段。
它看起来像使用多个Cookie头，其实，禁止！
Answer 2:
它现在允许HTTP / 2（ RFC 7540 ），其指定：
8.1.2.5. Compressing the Cookie Header Field
The Cookie header field [COOKIE] uses a semi-colon (";") to delimit
cookie-pairs (or "crumbs"). This header field doesn't follow the
list construction rules in HTTP (see [RFC7230], Section 3.2.2), which
prevents cookie-pairs from being separated into different name-value
pairs. This can significantly reduce compression efficiency as
individual cookie-pairs are updated.
To allow for better compression efficiency, the Cookie header field
MAY be split into separate header fields, each with one or more
cookie-pairs. If there are multiple Cookie header fields after
decompression, these MUST be concatenated into a single octet string
using the two-octet delimiter of 0x3B, 0x20 (the ASCII string "; ")
before being passed into a non-HTTP/2 context, such as an HTTP/1.1
connection, or a generic HTTP server application.
Therefore, the following two lists of Cookie header fields are
semantically equivalent.
cookie: a=b; c=d; e=f
cookie: a=b
cookie: c=d
cookie: e=f
文章来源: Are multiple Cookie headers allowed in an HTTP request?
