silveric10 commented on issue #4271:
URL: https://github.com/apache/apisix/issues/4271#issuecomment-843794735


   > You need to make sure that the execution priority of plugin A that sets 
the request header is greater than plugin B. How to set the request header, you 
can parameter proxy-rewrite plugin: 
https://github.com/apache/apisix/blob/master/apisix/plugins/proxy-rewrite.lua#L197
   Thanks.
   I'm sure that plugin A's priority is greater than plugin B's priority. I 
think the reason is I called core.request.header(ctx, ...) at the begining of 
plugin A, and set new header before plugin A return. The function 
core.request.header() only be update when it's first call, I think here is the 
code:    
   ```
    local headers = ctx.headers
    if not headers then
        headers = get_headers()
        ctx.headers = headers
   end
   ```


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