please help: How to remove content-length header?

[Diana Allende]

Hello all,

I understand from here https://github.com/openresty/lua-nginx-module#body_filter_by_lua that when the Lua code may change the length of the response body, then it is required to always clear out the Content-Length response header.

In my case I have a configuration like so inside location block
access_by_lua_block {
                require("my-lua-module").doSomething() -- this returns a response and exits
                }
Thus even if I have a block such as header_filter_by_lua_block { ngx.header.content_length = nil }, this code is never hit as there is an exit in the access_by_lua_block itself. Adding  ngx.header.content_length = nil to the beginning of access_by_lua_block doesn't work either.

As a result the content-length header is seen in the response which leads to errors such as 
Excess found in a read: excess = 1, size = 31, maxdownload = 31, bytecount = 0 (seen when curl request is issued)
Can someone please advise on how to overcome this?
Thanks for your help.

[李俊龙]

remove content-length in header_filter_b_lua_block 

[Kshitij Joshi]

you can also use more_clear_header

more_clear_headers 'content-length ';

https://github.com/openresty/headers-more-nginx-module#more_clear_headers