随手记录下ETag 和 p3p 协议神马的

这个吧……优化 V4 主站 …… 本来是看看接口稳定状况的，哪知被问了个 ETag。

就蛋疼的看了看 rfc2616……

13.3.2 Entity Tag Cache Validators

13.3.3 Weak and Strong Validators

13.3.4 Rules for When to Use Entity Tags and Last-Modified Dates

这三节说的很清楚了。

看看V4主站挺好，干脆没用ETag。

随手又看见个P3P，知道是个神马跨域通信协议，里面的配置毛都看不懂：

P3P:CP="CURa ADMa DEVa PSAo PSDo OUR BUS UNI PUR INT DEM STA PRE COM NAV OTC NOI DSP COR"

原来是紧凑写法：

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The corresponding associations among P3P purposes and compact policy codes follow:

[57]

compact-purpose

=

"CUR"        | ; for

"ADM" [creq] | ; for

"DEV" [creq] | ; for

"TAI" [creq] | ; for

"PSA" [creq] | ; for

"PSD" [creq] | ; for

"IVA" [creq] | ; for

"IVD" [creq] | ; for

"CON" [creq] | ; for

"HIS" [creq] | ; for

"TEL" [creq] | ; for

"OTP" [creq]   ; for

[58]

creq

=

"a"| ;"always"

"i"| ;"opt-in"

"o"  ;"opt-out"

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基本上也知道鸟。就这么地了。