ngx.location.capture() 变量继承
作者：天翼云开发者社区
- 2025-11-06 北京
本文字数：2281 字
阅读完需：约 7 分钟
本文分享自天翼云开发者社区《ngx.location.capture()变量继承》.作者：lucky_lyw
通过几个例子，简要分析 variable 与 ctx 在主请求与子请求中的关系。
copy_all_vars & share_all vars
server { listen [::]:80; #https配置-http访问端口v6格式 listen 80; #https配置-http访问端口v4格式 #listen [::]:443 ssl; #https配置-https访问端口v6格式 #listen 443 ssl; #https配置-https访问端口v4格式
#ssl_certificate ssl/vsochina.com.crt; #ssl_certificate_key ssl/vsochina.com.key # ssl_certificate conf.d/common/ssl/vsochina.com.crt; #ssl_certificate_key conf.d/common/ssl/vsochina.com.key
server_name www.l.com;
location /static { root /root/resources/; } location /sub { content_by_lua_block { ngx.log(ngx.ERR, "sub: ", ngx.var.dysta) ngx.var.dysta = "luoyuwen" ngx.log(ngx.ERR, "sub: ", ngx.var.dysta) } } location /main { content_by_lua_block { ngx.var.dysta="luoluo" ngx.log(ngx.ERR, "main: ", ngx.var.dysta) res = ngx.location.capture("/sub", {copy_all_vars=true}) ngx.log(ngx.ERR, "main: ", ngx.var.dysta) res = ngx.location.capture("/sub", {share_all_vars=true}) ngx.log(ngx.ERR, "sub: ", ngx.var.dysta) } }}
2022/07/12 14:07:42 [error] 770#0: *6 [lua] content_by_lua(www.l.com.conf:34):3: main: luoluo, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", host: "www.l.com"2022/07/12 14:07:42 [error] 770#0: *6 [lua] content_by_lua(www.l.com.conf:23):2: sub: luoluo, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", subrequest: "/sub", host: "www.l.com"2022/07/12 14:07:42 [error] 770#0: *6 [lua] content_by_lua(www.l.com.conf:23):4: sub: luoyuwen, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", subrequest: "/sub", host: "www.l.com"2022/07/12 14:07:42 [error] 770#0: *6 [lua] content_by_lua(www.l.com.conf:34):5: main: luoluo, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", host: "www.l.com"2022/07/12 14:07:42 [error] 770#0: *6 [lua] content_by_lua(www.l.com.conf:23):2: sub: luoluo, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", subrequest: "/sub", host: "www.l.com"2022/07/12 14:07:42 [error] 770#0: *6 [lua] content_by_lua(www.l.com.conf:23):4: sub: luoyuwen, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", subrequest: "/sub", host: "www.l.com"2022/07/12 14:07:42 [error] 770#0: *6 [lua] content_by_lua(www.l.com.conf:34):7: sub: luoyuwen, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", host: "www.l.com"复制代码
结论：
copy 仅赋值，share 共享
ctx
location /sub { content_by_lua_block { ngx.log(ngx.ERR, "sub: ", ngx.ctx.foo) ngx.ctx.foo = "bar" ngx.log(ngx.ERR, "sub: ", ngx.ctx.foo) } } location /main { content_by_lua_block { ngx.ctx.foo = "luoluo" local ctx = {} ctx.foo = "mm" ngx.log(ngx.ERR, "main: ", ngx.ctx.foo) res = ngx.location.capture("/sub", {ctx=ctx}) ngx.log(ngx.ERR, "main: ", ngx.ctx.foo) ngx.log(ngx.ERR, "main: ", ctx.foo) } }
2022/07/12 13:56:11 [error] 770#0: *4 [lua] content_by_lua(www.l.com.conf:35):5: main: luoluo, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", host: "www.l.com"2022/07/12 13:56:11 [error] 770#0: *4 [lua] content_by_lua(www.l.com.conf:23):2: sub: mm, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", subrequest: "/sub", host: "www.l.com"2022/07/12 13:56:11 [error] 770#0: *4 [lua] content_by_lua(www.l.com.conf:23):4: sub: bar, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", subrequest: "/sub", host: "www.l.com"2022/07/12 13:56:11 [error] 770#0: *4 [lua] content_by_lua(www.l.com.conf:35):7: main: luoluo, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", host: "www.l.com"2022/07/12 13:56:11 [error] 770#0: *4 [lua] content_by_lua(www.l.com.conf:35):8: main: bar, client: 127.0.0.1, server: www.l.com, request: "GET /main HTTP/1.1", host: "www.l.com"复制代码
结论：
主请求与子请求中的 ctx 可以赋值并相互影响。
ngx.location.capture("/uri", {ctx_a = ctx_b})
ctx_a 为子请求中的 ngx.ctx，ctx_b 为主请求中的 ctx_b, 若该值为 ngx.ctx，则为主请求中的 ngx.ctx。
首先，将 ctx_b 赋值给子请求中的 ngx.ctx。
子请求中可查询 ngx.ctx，其值为主请求的 ctx_b
若在子请求中更改 ngx.ctx，则会映射到主请求中的 ctx_b
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