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request-header
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... HTTP header fields, which include general-header (section 4.5),
request-header (section 5.3), response-header (section 6.2), and
entity ...
... received is not significant. However, it is "good practice" to send
general-header fields first, followed by request-header or response-
header fields, and ending with the entity ...
...
The request-header fields allow the client to pass additional
information about the request, and about the client ...
... invocation.
request-header = Accept ; Section 14.1
| Accept-Charset ; Section 14.2
...
... User-Agent ; Section 14.42
Request-header field names can be extended reliably only in
combination with a change in the protocol version. However, new or
...
... header fields if all parties in the communication recognize them to
be request-header fields. Unrecognized header fields are treated as
entity ...
... connection to the server
2. Transmit the request-headers
3. Initialize a variable R to the estimated round-trip time ...
...
The precondition given in one or more of the request-header fields
evaluated to false when it was tested on the server. This response
code allows the client ...
...
HTTP/1.1 includes the following request-header fields for enabling
server-driven negotiation through description of user agent ...
... origin server is not limited to these dimensions and MAY vary the
response based on any aspect of the request, including information
outside the request-header fields or within extension header fields
not defined by this specification.
...
... cache that the
representation was selected using criteria not limited to the
request-headers; in this case, a cache MUST NOT use the response in a
reply to a subsequent request unless the cache ...
...
The Accept request-header field can be used to specify certain media
types which are acceptable for the response. Accept headers can be
...
...
The Accept-Charset request-header field can be used to indicate what
character sets are acceptable for the response. This field allows
...
...
The Accept-Encoding request-header field is similar to Accept, but
restricts the content-coding values (section 14.12) which are
acceptable in the response.
...
...
The Accept-Language request-header field is similar to Accept, but
restricts the set of natural languages that are preferred as a
...
... receiving a 401 response--MAY do
so by including an Authorization request-header field with the
request. The Authorization field value consists of credentials ...
... proxy cache MUST first revalidate it with
the origin server, using the request-headers from the new request
to allow the origin server to authenticate the new request.
...
... subsequent request, but all caches MUST first revalidate it with
the origin server, using the request-headers from the new request
to allow the origin server to authenticate the new request.
...
...
The If-Modified-Since request-header field is used with the GET
method to make it conditional: if the requested variant has not been
modified since the time specified in this field, an entity ...
...
Note that the Range request-header field modifies the meaning of
If-Modified-Since; see section 14.36 for full details.
...
...
The If-None-Match request-header field is used with a method to make
it conditional. A client ...
... cache, it
could use the Range request-header with a conditional GET (using
either or both of If-Unmodified-Since and If-Match.) However, if the
condition fails because the entity ...
...
The If-Unmodified-Since request-header field is used with a method to
make it conditional. If the requested resource has not been modified
...
... The Proxy-Authorization request-header field allows the client to
identify itself (or its user) to a proxy ...
...
The Referer[sic] request-header field allows the client to specify,
for the server's benefit, the address ...
... Request-URI was obtained (the "referrer", although the
header field is misspelled.) The Referer request-header allows a
server to generate lists of back-links to resources for interest,
...
...
The User-Agent request-header field contains information about the
user agent originating the request. This is for statistical purposes,
...
... negotiation (section 12). Field-
names listed in Vary headers are those of request-headers. The Vary
field value indicates either that the given set of header fields
...
... The set of header fields named by the Vary field value is known as
the "selecting" request-headers.
When the cache ...
...
are present in the new request, and all of the stored selecting
request-headers from the previous request match the corresponding
headers in the new request.
...
... headers in the new request.
The selecting request-headers from two requests are defined to match
if and only if the selecting request-headers in the first request can
...
... The selecting request-headers from two requests are defined to match
if and only if the selecting request-headers in the first request can
be transformed to the selecting request-headers in the second request
...
... if and only if the selecting request-headers in the first request can
be transformed to the selecting request-headers in the second request
by adding or removing linear whitespace (LWS) at places where this is
...
...
A Vary field value of "*" signals that unspecified parameters,
possibly other than the contents of request-header fields (e.g., the
network address ...
... the representation selected for the response is based on a selection
algorithm which considers ONLY the listed request-header field values
in selecting the most appropriate representation. A cache MAY assume
...
... The field-names given are not limited to the set of standard
request-header fields defined by this specification. Field names are
case-insensitive.
...
...
Accept request-headers can reveal information about the user to all
servers which are accessed. The Accept-Language header ...
... header, report an error if the Host request-header (section 14.23) is
missing from an HTTP/1.1 request, and accept absolute URIs ...
... HTTP/1.1
request does not include a Host request-header.
o Servers MUST accept absolute URIs ...