访问是会出现如下错误：

错误
您所请求的网址（URL）无法获取

--------------------------------------------------------------------------------

当尝试进行以下请求时：

GET /forum-6-1.html HTTP/1.1
Accept: */*
Accept-Language: zh-cn
UA-CPU: x86
Accept-Encoding: gzip, deflate
User-Agent: Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; TheWorld)
Host: www.example.com
Connection: Keep-Alive
Cookie: rtime=29; ltime=1312185462343; cnzz_eid=47033647-1307597230-; cnzz_a2967008=9; sin2967008=; pgv_pvi=5092063248; Hm_lvt_19a7cf164294dff4a56c7490c27fa037=1312185462593; __utma=25581497.895693467.1307600638.1312169477.1312185463.79; __utmz=25581497.1307600638.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none); lzstat_uv=37664384421587457303|926044@1265351@793358@1072479@1148619@869108@788690@1275240@1246808; i0B_cookietime=2592000; i0B_sid=XogUqO; i0B_visitedfid=6D19D2D21; i0B_auth=ZvBZGLoCB97WXv20ZnMuhh0CPFc1XmWvr6v8Sfh1WgfrmtnLkh84%2B8xBRaQjoh7yN2knN6MlZGKccCThnNCZtu%2FHWcPxjPnpDgs%2BDGmh%2B7r0FxIYI%2FaK09CjRxQ2nQ1uvjKb9bcaFDZia13orh37; i0B_uc_uid=2042498; pgv_info=ssi=s2496081862; Hm_lpvt_19a7cf164294dff4a56c7490c27fa037=1312185462593; __utmb=25581497.1.10.1312185463; __utmc=25581497; checkpm=1; i0B_pmnum=0


发生了下列的错误：

Invalid Request
无效的请求
Some aspect of the HTTP Request is invalid. Possible problems:
HTTP 请求的某些方面是无效的。可能是下列问题：

Missing or unknown request method
缺少请求方式或未知的请求方式
Missing URL
缺少网址
Missing HTTP Identifier (HTTP/1.0)
缺少 HTTP 标识（HTTP/1.0）
Request is too large
请求命令过长
Content-Length missing for POST or PUT requests
POST 或 PUT 请求缺少内容长度
Illegal character in hostname; underscores are not allowed
主机名称中包含不合法的字符；下划线是不允许的。


解决办法：
vim  squid.conf
把"http_port 80" 改成 "http_port 80 transparent"