Redirect to same URL with Lua on Nginx (openresty setup)
I'm looking to modify a request header and redirect it in Lua, I've tried
ngx.redirect("/")
and
ngx.exec("/")
but I'm getting following error:
attempt to call ngx.redirect after sending out the headers
Is there a straightforward way to add a header value and redirect it somewhere else in Lua? In the documentation I didn't find any appropriate directive, Is there a way something like this can be done while still using content_by_lua_file ?
I'm using openresty.
Answer
From the redirect method documentation:
Note that this method call terminates the processing of the current request and that it must be called before ngx.send_headers or explicit response body outputs by either ngx.print or ngx.say.
So check that or use another request phase handler such as rewrite_by_lua.
As for setting a header, use ngx.header
E.g:
location /testRedirect {
content_by_lua '
ngx.header["My-header"]= "foo"
return ngx.redirect("http://www.google.com")
';
}
output:
HTTP/1.1 302 Moved Temporarily
Server: openresty
Date: Tue, 30 Jun 2015 17:34:38 GMT
Content-Type: text/html
Content-Length: 154
Connection: keep-alive
My-header: foo
Location: http://www.google.com
<html>
<head><title>302 Found</title></head>
<body bgcolor="white">
<center><h1>302 Found</h1></center>
<hr><center>nginx</center>
</body>
</html>
Note: Most sites will NOT accept custom header coming from a redirect, so consider using a cookie on that case.