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
发布文章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"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"
*博客内容为网友个人发布，仅代表博主个人观点，如有侵权请联系工作人员删除。
