squid中得参数问题

system71

reply_body_max_size
maximum_object_size
request_body_max_size

请squid中这三个参数是什么意思，请各位大大解释一下。

凡夫子

NAME: reply_body_max_size
COMMENT: bytes allow|deny acl acl...
TYPE: body_size_t
DEFAULT: none
DEFAULT_IF_NONE: 0 allow all
LOC: Config.ReplyBodySize
DOC_START
        This option specifies the maximum size of a reply body in bytes.
        It can be used to prevent users from downloading very large files,
        such as MP3's and movies. When the reply headers are received,
        the reply_body_max_size lines are processed, and the first line with
        a result of "allow" is used as the maximum body size for this reply.
        This size is checked twice. First when we get the reply headers,
        we check the content-length value.  If the content length value exists
        and is larger than the allowed size, the request is denied and the
        user receives an error message that says "the request or reply
        is too large." If there is no content-length, and the reply
        size exceeds this limit, the client's connection is just closed
        and they will receive a partial reply.

        WARNING: downstream caches probably can not detect a partial reply
        if there is no content-length header, so they will cache
        partial responses and give them out as hits.  You should NOT
        use this option if you have downstream caches.

        If you set this parameter to zero (the default), there will be
        no limit imposed.
DOC_END

NAME: maximum_object_size
COMMENT: (bytes)
TYPE: b_size_t
DEFAULT: 4096 KB
LOC: Config.Store.maxObjectSize
DOC_START
        Objects larger than this size will NOT be saved on disk.  The
        value is specified in kilobytes, and the default is 4MB.  If
        you wish to get a high BYTES hit ratio, you should probably
        increase this (one 32 MB object hit counts for 3200 10KB
        hits).  If you wish to increase speed more than your want to
        save bandwidth you should leave this low.

        NOTE: if using the LFUDA replacement policy you should increase
        this value to maximize the byte hit rate improvement of LFUDA!
        See replacement_policy below for a discussion of this policy.
DOC_END

NAME: request_body_max_size
COMMENT: (KB)
TYPE: b_size_t  
DEFAULT: 0 KB
LOC: Config.maxRequestBodySize
DOC_START      
        This specifies the maximum size for an HTTP request body.
        In other words, the maximum size of a PUT/POST request.
        A user who attempts to send a request with a body larger
        than this limit receives an "Invalid Request" error message.
        If you set this parameter to a zero (the default), there will
        be no limit imposed.
DOC_END