mirror of
https://github.com/EtherDream/jsproxy
synced 2024-11-22 09:58:46 +00:00
74 lines
1.8 KiB
Lua
74 lines
1.8 KiB
Lua
-- 功能：编码 HTTP 返回头
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-- 阶段：header_filter_by_lua
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-- 备注：
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-- aceh = HTTP 返回头的 access-control-expose-headers 字段
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-- 无论浏览器是否支持，aceh 始终包含 *
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local expose = '*'
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-- 该值为 true 表示浏览器不支持 aceh: *，需返回详细的头部列表
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local detail = (ngx.ctx._aceh == 1)
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-- 由于接口路径固定，为避免被缓存，以请求头的 --url 值区分缓存
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local vary = '--url'
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local h, err = ngx.resp.get_headers()
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for k, v in pairs(h) do
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if
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-- 这些头有特殊意义，需要转义 --
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k == 'access-control-allow-origin' or
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k == 'access-control-expose-headers' or
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k == 'location' or
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k == 'set-cookie'
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then
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if type(v) == 'table' then
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for i = 1, #v do
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local x = i .. '-' .. k
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ngx.header[x] = v[i]
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if detail then
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expose = expose .. ',' .. x
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end
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end
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else
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local x = '--' .. k
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ngx.header[x] = v
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if detail then
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expose = expose .. ',' .. x
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end
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end
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ngx.header[k] = nil
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elseif k == 'vary' then
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if type(v) == 'table' then
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vary = vary .. ',' .. table.concat(v, ',')
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else
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vary = vary .. ',' .. v
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end
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elseif detail and
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-- 非简单头无法被 fetch 读取，需添加到 aceh 列表 --
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-- https://developer.mozilla.org/en-US/docs/Glossary/Simple_response_header
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k ~= 'cache-control' and
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k ~= 'content-language' and
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k ~= 'content-type' and
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k ~= 'expires' and
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k ~= 'last-modified' and
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k ~= 'pragma'
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then
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expose = expose .. ',' .. k
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end
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end
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if detail then
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expose = expose .. ',--s'
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ngx.header['--t'] = '1'
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end
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ngx.header['access-control-expose-headers'] = expose
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ngx.header['access-control-allow-origin'] = '*'
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ngx.header['vary'] = vary
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ngx.header['--s'] = ngx.status
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ngx.status = 200 |