Access ngx.var.Variable outside Lua block

[DevX]

Hi,

I'm setting the ngx variable inside content by lua block but the updated value is not available outside.

set $varEx ' '

content_by_lua_block {

ngx.var.varEx = "someNewValue"

}

proxy_set_header $xxx $varEx

proxy_pass

I want to use the updated value to pass as header before proxy_pass. 

Same is working with capture, but the api response is large. So have to avoid capture.

Please suggest.

Thanks.

[DevX]

Any other way to access variables across with good performance would be of great help.

[Michael Noe]

Is it due to the missing semicolons?  I’m doing the same thing with content_by_lua_file and it definitely works.

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[Gene Unigovski]

...use set_by_lua_block or access_by_lua_block - proxy_pass and content_by_lua_block are on the same req processing step...

...you cam also use ngx.req.set_header() instead of proxy_set_header - it would make code cleaner... 

[DevX]

Thanks for the info. 

We can set header using ngx.req.set_header() and ngx.var.http_headerName . Which one is better ?

[Gene Unigovski]

...these two are different ...I would suggest to use ngx.req.set_header() - especially in case if you are planning to proxy_pass request to upstream... 

[DevX]

Cool thanks.