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rewrite / proxy_pass different bahaviour in 1.0 and 1.2
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- Subject: rewrite / proxy_pass different bahaviour in 1.0 and 1.2
- From: "alexey.radkov" <nginx-forum@xxxxxxxx>
- Date: Fri, 28 Sep 2012 11:36:49 -0400
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Hi guys.
Is the following result of a bug fix in proxy module in 1.2 series?
Imagine following config (sorry, i do not know how to format it here):
events {
worker_connections 1024;
}
http {
upstream ubackend {
server localhost:8020;
}
server {
listen 8010;
server_name router;
location /test.html {
rewrite ^ /Internal_test last;
}
location /Internal_test {
internal;
proxy_pass http://$arg_a;
}
}
server {
listen 8020;
server_name backend;
location /test.html {
echo "In backend";
}
}
}
and following request:
curl 'http://localhost:8010/test.html?a=ubackend'
Then 1.0 behaviour:
In backend
1.2 behaviour:
<html>
<head><title>404 Not Found</title></head>
<body bgcolor="white">
<center><h1>404 Not Found</h1></center>
<hr><center>nginx/1.2.3</center>
</body>
</html>
ngrep traces:
1.0:
#####
U 127.0.0.1:36906 -> 127.0.0.1:36906
.
######
T 127.0.0.1:44685 -> 127.0.0.1:8010 [AP]
GET /test.html?a=ubackend HTTP/1.1.
User-Agent: curl/7.24.0 (x86_64-redhat-linux-gnu) libcurl/7.24.0
NSS/3.13.5.0 zlib/1.2.5 libidn/1.24 libssh2/1.4.1.
Host: localhost:8010.
Accept: */*.
.
#####
T 127.0.0.1:39418 -> 127.0.0.1:8020 [AP]
GET /test.html?a=ubackend HTTP/1.0.
Host: ubackend.
Connection: close.
User-Agent: curl/7.24.0 (x86_64-redhat-linux-gnu) libcurl/7.24.0
NSS/3.13.5.0 zlib/1.2.5 libidn/1.24 libssh2/1.4.1.
Accept: */*.
.
##
T 127.0.0.1:8020 -> 127.0.0.1:39418 [AP]
HTTP/1.1 200 OK.
Server: nginx/1.0.10.
Date: Fri, 28 Sep 2012 15:07:55 GMT.
Content-Type: text/html.
Content-Length: 11.
Connection: close.
.
In backend
#####
T 127.0.0.1:8010 -> 127.0.0.1:44685 [AP]
HTTP/1.1 200 OK.
Server: nginx/1.0.10.
Date: Fri, 28 Sep 2012 15:07:55 GMT.
Content-Type: text/html.
Connection: keep-alive.
Content-Length: 11.
.
In backend
1.2 :
#
U 127.0.0.1:36906 -> 127.0.0.1:36906
.
######
T 127.0.0.1:44696 -> 127.0.0.1:8010 [AP]
GET /test.html?a=ubackend HTTP/1.1.
User-Agent: curl/7.24.0 (x86_64-redhat-linux-gnu) libcurl/7.24.0
NSS/3.13.5.0 zlib/1.2.5 libidn/1.24 libssh2/1.4.1.
Host: localhost:8010.
Accept: */*.
.
#####
T 127.0.0.1:39429 -> 127.0.0.1:8020 [AP]
GET /Internal_test?a=ubackend HTTP/1.0.
Host: ubackend.
Connection: close.
User-Agent: curl/7.24.0 (x86_64-redhat-linux-gnu) libcurl/7.24.0
NSS/3.13.5.0 zlib/1.2.5 libidn/1.24 libssh2/1.4.1.
Accept: */*.
.
##
T 127.0.0.1:8020 -> 127.0.0.1:39429 [AP]
HTTP/1.1 404 Not Found.
Server: nginx/1.2.3.
Date: Fri, 28 Sep 2012 15:08:51 GMT.
Content-Type: text/html.
Content-Length: 168.
Connection: close.
.
<html>.
<head><title>404 Not Found</title></head>.
<body bgcolor="white">.
<center><h1>404 Not Found</h1></center>.
<hr><center>nginx/1.2.3</center>.
</body>.
</html>.
#####
T 127.0.0.1:8010 -> 127.0.0.1:44696 [AP]
HTTP/1.1 404 Not Found.
Server: nginx/1.2.3.
Date: Fri, 28 Sep 2012 15:08:51 GMT.
Content-Type: text/html.
Content-Length: 168.
Connection: keep-alive.
.
<html>.
<head><title>404 Not Found</title></head>.
<body bgcolor="white">.
<center><h1>404 Not Found</h1></center>.
<hr><center>nginx/1.2.3</center>.
</body>.
</html>.
So the difference is that in 1.0 original URI is not rewritten in HTTP GET
header when proxied after rewrite, but in 1.2 it is rewritten to
/Internal_test thus giving result 404 Not Found.
Do I understand this right that 1.0 behaviour was not correct and just fixed
in 1.2?
To achieve 1.0 behaviour in 1.2 i can add only 2 lines of code from 1.0.
Here is diff:
--- ngx_http_proxy_module.c 2012-09-28 19:16:42.416144040 +0400
+++ ngx_http_proxy_module.c.new 2012-09-28 19:16:33.505015157 +0400
@@ -783,10 +783,13 @@
ngx_memcpy(p, url.uri.data, url.uri.len);
url.uri.len++;
url.uri.data = p - 1;
}
+
+ } else {
+ url.uri = r->unparsed_uri;
}
ctx->vars.key_start = u->schema;
ngx_http_proxy_set_vars(&url, &ctx->vars);
Cheers, Alexey.
Posted at Nginx Forum:
http://forum.nginx.org/read.php?21,231218,231218#msg-231218
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