saiyoofan opened a new issue #6643:
URL: https://github.com/apache/apisix/issues/6643
### Description
modify ctx.lua to support content-type
application/x-www-form-urlencoded;charset=utf-8 to match route
like this:
```
253 elseif core_str.has_prefix(key, "post_arg_") then
254 -- only match default post form
255 local con_t = request.header(nil, "Content-Type")
256 local con_t_s = sub_str(con_t, 1, 33)
257 if con_t_s == "application/x-www-form-urlencoded"
then
258 local arg_key = sub_str(key, 10)
259 local args = request.get_post_args()[arg_key]
260 if args then
261 if type(args) == "table" then
262 val = args[1]
263 else
264 val = args
265 end
266 end
267 end
```
get some errors:
```
[error] 51#51: *10048 lua entry thread aborted: runtime error:
/usr/local/apisix/apisix/core/ctx.lua:256: bad argument #1 to 'sub_str' (string
expected, got nil)
stack traceback:
coroutine 0:
[C]: in function 'sub_str'
/usr/local/apisix/apisix/core/ctx.lua:256: in function '__index'
/usr/local/apisix//deps/share/lua/5.1/resty/expr/v1.lua:291: in
function 'eval'
/usr/local/apisix/apisix/plugins/traffic-split.lua:253: in function
'phase_func'
/usr/local/apisix/apisix/plugin.lua:720: in function 'run_plugin'
/usr/local/apisix/apisix/init.lua:471: in function 'http_access_phase
```
so ,how can I repair it.
thx.
### Environment
- APISIX version (run `apisix version`):
- Operating system (run `uname -a`):
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
- etcd version, if relevant (run `curl
http://127.0.0.1:9090/v1/server_info`):
- APISIX Dashboard version, if relevant:
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):
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