Sometimes my IIS server starts responding with 304 HTTP status to non-conditional requests. I have yet to determine exactly when this happens, but when it starts all browsers keep getting 304.
This is the request (debugged using fiddler):
GET http://www.example.com/aaa/bbb/GetStaticResult HTTP/1.1
Host: www.example.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:28.0) Gecko/20100101 Firefox/28.0
Accept: */*
Accept-Language: es-ES,es;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://localhost:12345/xxx
Origin: http://localhost:12345
Connection: keep-alive
Pragma: no-cache
Cache-Control: no-cache
And the response:
HTTP/1.1 304 Not Modified
Cache-Control: public
Expires: Thu, 30 Apr 2015 09:23:22 GMT
Last-Modified: Wed, 30 Apr 2014 09:23:22 GMT
Server: Microsoft-IIS/7.5
X-Powered-By: ASP.NET
Date: Wed, 30 Apr 2014 10:33:58 GMT
The ASP.NET MVC method is the following:
[HttpGet]
[OutputCache(Duration = int.MaxValue, VaryByParam = "")]
public string GetStaticResult()
{
return "static";
}
The request hasn't any If-Modified-Since (or similar) header. Shouldn't the server issue a 200 response?
May be related with Getting a 304 if there is no If-Modified-Since sent?
Related
I'm facing a weird behaviour on chrome with http get requests that most likely has something to do with cache.
Basically, the same request returns 200 the first time, then if I send the same request again by entering again the URL bar it returns 404. THen again 200. Then 404.
The request looks something like this (by using the dev tools on chrome) I use ## to hide sensitive info
General:
Request URL: ###
Request Method: GET
Status Code: 200 OK
Remote Address: ##############
Referrer Policy: strict-origin-when-cross-origin
Response Headers:
Accept-Ranges: bytes
Cache-Control: max-age=0, no-cache
Content-Length: 75209
Content-Type: application/json
Date: Fri, 10 Sep 2021 10:29:22 GMT
ETag: W/"IDGfBPV6nmAIDGefDH3A0M"
Last-Modified: Wed, 08 Sep 2021 08:36:01 GMT
Server: Jetty(9.4.z-SNAPSHOT)
Request headers
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en,it-IT;q=0.9,it;q=0.8,en-US;q=0.7
Connection: keep-alive
Cookie: ##################
Host: #########
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36
If i now press enter in the URL bar issuing the request again i get the following response:
General
Request URL: ####
Request Method: GET
Status Code: 404 Not Found
Remote Address: ######
Referrer Policy: strict-origin-when-cross-origin
Response Headers
Cache-Control: must-revalidate,no-cache,no-store
Content-Length: 347
Content-Type: text/html;charset=iso-8859-1
Date: Fri, 10 Sep 2021 10:29:05 GMT
ETag: W/"IDGfBPV6nmAIDGefDH3A0M"
Server: Jetty(9.4.z-SNAPSHOT)
Request Headers
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: en,it-IT;q=0.9,it;q=0.8,en-US;q=0.7
Cache-Control: max-age=0
Connection: keep-alive
Cookie: #################
Host: ####
If-Modified-Since: Wed, 08 Sep 2021 08:36:01 GMT
If-None-Match: W/"IDGfBPV6nmAIDGefDH3A0M"
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.63 Safari/537.36
And so on, 200, 404, 200, 404 ...
Differences I noticed are in the Cache-Control header of the response and the new If-Modified-Since and If-None-Match request headers.
The backend server is a proprietary server and between the client there is an Apache Proxy Server.
I know that to get the solution I should provide more data (maybe the httpd configuration) but I'm more like trying to understand what the issue is rather than asking for a magic solution.
I searched on google "Get request works on and off" and all sort of wording variations but had no luck.
If anyone could help me out at least understanding the problem
Thanks
Davide
UPDATE
As Kevin suggested in the comment, shutting down the apache proxy did not change this on/off behaviour. Has to be something within the origin server
The server log says:
[04/Nov/2019:23:11:23 +0100] "GET /imgs/flags/fr.png HTTP/1.1" 200 2173 "http://XXXXX.com/user/start" "Mozilla/5.0 (Linux; Android 5.0; SM-G900P Build/LRX21T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3959.0 Mobile Safari/537.36"
However, they are being served as text:
This is only happening in production though... in localhost it works fine.
This image loads ok: /imgs/logo_only_transparent.png
This image does not load: /imgs/flags/es.png
Using Ubuntu 18.04, php 7.2, Laravel 6, Vue 2.x
What am I missing?
From the network tab:
Request Method: GET
Status Code: 200 OK
Referrer Policy: no-referrer-when-downgrade
Cache-Control: no-cache, private
Connection: Keep-Alive
Content-Encoding: gzip
Content-Length: 1205
Content-Type: text/html; charset=UTF-8
Date: Mon, 04 Nov 2019 22:11:23 GMT
Keep-Alive: timeout=5, max=100
Server: Apache/2.4.29 (Ubuntu)
Set-Cookie: XSRF-TOKEN=eyJpdiI6IkFcL3lRY2JcL0o1R0VyNmRzeXdHcytsQT09IiwidmFsdWUiOiJMNWoyeUUyeW1lMG4zOFNRWnVDWG5jRU1FOFU2bVRuTzl6WmZqQlwvVGFXdnhQWVBVM29vbW1JTEszMldlXC9ra1IiLCJtYWMiOiJjM2JmODA4M2RiODVjZjJjODM5NTliYTFiMzI3NzU2ZDk0YjQwNmY3YTU3YzE1NmE3NzI3ZDM2YTIxODQ2YTY3In0%3D; expires=Tue, 05-Nov-2019 00:11:23 GMT; Max-Age=7200; path=/
Vary: Accept-Encoding
Accept: image/webp,image/apng,image/*,*/*;q=0.8
Accept-Encoding: gzip, deflate
Accept-Language: es,en;q=0.9
Connection: keep-alive
EDIT (Solved): The reason was that the file is named ES.png no es.png. Apparently this is not an issue when running XAMPP in Windows but it when running it in Ubuntu.
If we send a request from any host like example.com our server gives back a HTTP 1.1 200 OK response status.
In correct condition it should show either 302, 400 or 404 error message (not found response) status. At current condition it is showing 200 OK response message, when its send through our host like xx.xxx.xx.xx.
For example, if we sent this request:
GET /web/ HTTP/1.1 Host: example.com User-Agent: Mozilla/5.0 (Windows
NT 10.0; WOW64; rv:51.0) Gecko/20100101 Firefox/51.0 Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8
Accept-Language: en-US,en;q=0.5 Connection: close
Upgrade-Insecure-Requests: 1
We get this response:
HTTP/1.1 200 OK Date: Thu, 02 Mar 2017 15:23:20 GMT Server:
figi_Server X-Frame-Options: deny Strict-Transport-Security: 1 Vary:
Accept-Encoding X-Content-Type-Options: nosniff X-Frame-Options:
sameorigin X-XSS-Protection: 1; mode=block
Using
OS: Ubuntu 14.04.
Web server: Apache 2.2.
Virtual machine running both.
Please go through Screen Shot Of Issue for better Understanding of Issue:
i want to login to site with my account but using vb.net "httpwebrequest"
this is the header :
http://www.alexasurfing.com/login?task=user.login
POST /login?task=user.login HTTP/1.1
Host: www.alexasurfing.com
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:47.0) Gecko/20100101 Firefox/47.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Referer: http://www.alexasurfing.com/login
Cookie: __cfduid=d09a17b9b5acf54646546541471462027; refid=14786;
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 159
username=GMAL%40gmail.com&password=PASWW&remember=yes
HTTP/1.1 303 See other
Date: Wed, 17 Aug 2016 19:30:48 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
X-Powered-By: PHP/5.5.9-1ubuntu4.17
Location: /dashboard/profile
Server: cloudflare-nginx
i dont know how to use httpwebrequest to login to the site with my account ?
See the example here:
HTTP request with post
your post data is: username=GMAL%40gmail.com&password=PASWW&remember=yes
Note: You are sending plain text password over http. If there's an https option you should use that.
My browser send to the server the following request:
Host: www.imprimante.be
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:38.0) Gecko/20100101 Firefox/38.0
Accept: */*
Accept-Language: fr,fr-FR;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
If-Modified-Since: Fri, 29 May 2015 14:22:44 GMT
If-None-Match: "90-5173935ad3a1a-gzip"
Referer: http://www.imprimante.be/premier-avis-gratuit/
Cookie: <hidden>
Connection: keep-alive
The url used is http://www.imprimante.be/wp-content/themes/mch_imprimante/js/theme.min.js? (note: www.imprimante.be is not accessible trough wlan yet)
And the server send me the file with this (status 200) http header:
Accept-Ranges: bytes
Connection: Keep-Alive
Content-Encoding: gzip
Content-Length: 137
Content-Type: application/javascript
Date: Wed, 03 Jun 2015 07:18:03 GMT
Etag: "90-5173935ad3a1a-gzip"
Keep-Alive: timeout=5, max=99
Last-Modified: Fri, 29 May 2015 14:22:44 GMT
Server: Apache/2.4.10 (Debian)
Vary: Accept-Encoding
As you might notice (Last-Modified: Fri, 29 May 2015 14:22:44 GMT) the file hasn't been modified since the last request.
So I don't get why the response isn't a 304 status: not modified.
I'd really like to know why the caching of this files (and some others) doesn't work as I expect it.
It is bug in Apache. Turn off mod_deflate.