清漆：vcl_errorredirect

我有一些关于清漆configuration的问题。 我有这个简单的configuration文件：

backend default { .host = "127.0.0.1"; .port = "80"; } sub vcl_recv { if (req.http.Host == "192.168.1.100") { set req.http.Location = "http://example.com" req.url; error 750 "Permanently moved - TEST"; } } sub vcl_error { if (obj.status == 750) { set obj.http.Location = req.http.Location; set obj.status = 301; return(deliver); } } 

题：

（1）我跟着这个例子： set req.http.Location = "http://example.com" + req.url; – 但是我不能重新加载清漆，除非我删除这个+符号 – 它是必需的，它的目的是什么？

 # /etc/init.d/varnish reload Loading vcl from /etc/varnish/default.vcl Current running config name is reload_2013-12-17T15:01:43 Using new config name reload_2013-12-17T15:18:31 Message from VCC-compiler: Expected variable, string or semicolon (input Line 124 Pos 58) set req.http.Location = "http://example.com" + req.url; ---------------------------------------------------------#--------- Running VCC-compiler failed, exit 1VCL compilation failed Command failed with error code 106 varnishadm -S /etc/varnish/secret -T 127.0.0.1:6082 vcl.load failed 

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 set req.http.Location = "http://example.com" req.url;