dickens7 opened a new issue #2191:
URL: https://github.com/apache/apisix/issues/2191


   - parameters passed when using the function
   
   
https://github.com/apache/apisix/blob/3ece377d3ff920a3f46c0fa93312e5d7b276f63f/apisix/plugins/zipkin/codec.lua#L101-L103
   
   
   
   - the actual parameters defined by the function
   > 
https://github.com/iresty/opentracing-openresty/blob/master/opentracing/span_context.lua#L33-L37
   ```lua
   -- Public constructor
   local function new(trace_id, span_id, parent_id, baggage)
        if trace_id == nil then
                trace_id = generate_trace_id()
   ....
   ```
   
   
   - error log
   
   ```text
   apisix_1    | 2020/09/09 03:14:32 [error] 24#24: *61 lua entry thread 
aborted: runtime error: /usr/local/apisix/apisix/plugins/zipkin/codec.lua:116: 
bad argument #1 to '(for generator)' (table expected, got boolean)
   apisix_1    | stack traceback:
   apisix_1    | coroutine 0:
   apisix_1    |   [C]: in function '(for generator)'
   apisix_1    |   /usr/local/apisix/apisix/plugins/zipkin/codec.lua:116: in 
function 'inject'
   apisix_1    |   /usr/local/apisix/apisix/plugins/zipkin.lua:156: in function 
'phase_fun'
   apisix_1    |   /usr/local/apisix/apisix/init.lua:130: in function 
'run_plugin'
   apisix_1    |   /usr/local/apisix/apisix/init.lua:315: in function 
'http_access_phase'
   apisix_1    |   access_by_lua(nginx.conf:167):2: in main chunk, client: 
172.16.215.41, server: , request: "POST /event/xxxx HTTP/1.1", host: 
"172.16.210.58:9080"
   ```
   
   


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