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perf: replace str_sub with str_byte #317

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perf: replace str_sub with str_byte #317

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4 changes: 3 additions & 1 deletion lib/resty/http.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@ local str_lower = string.lower
local str_upper = string.upper
local str_find = string.find
local str_sub = string.sub
local str_byte = string.byte
local tbl_concat = table.concat
local tbl_insert = table.insert
local ngx_encode_args = ngx.encode_args
Expand Down Expand Up @@ -38,6 +39,7 @@ local ipairs = ipairs
local pairs = pairs
local pcall = pcall
local type = type
local QUESTION_MARK = str_byte("?")


-- http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
Expand Down Expand Up @@ -316,7 +318,7 @@ local function _format_request(self, params)
query = ngx_encode_args(query)
end

if query ~= "" and str_sub(query, 1, 1) ~= "?" then
if query ~= "" and str_byte(query) ~= QUESTION_MARK then
query = "?" .. query
end

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