To subscribe to this RSS feed, copy and paste this URL into your RSS reader. rev2022.12.9.43105. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is there a verb meaning depthify (getting more depth)? Connect and share knowledge within a single location that is structured and easy to search. Precision : CentOS 6, Apache 2.2.15 latest patch version. The value part of the Header instruction is: value may be a character string, a string containing format specifiers or a combination of both. The normal mode is late, when Request Headers are set immediately before running the content generator and Response Headers just as the response is sent down the wire. Why did the Council of Elrond debate hiding or sending the Ring away, if Sauron wins eventually in that scenario? SetEnvIf thing ^ (. We handle the concatenation correctly with the (,| |^) regexp trick, but the problem is that Apache seems to run the SetEnvIf only against the first occurrence of the Header. But this has nothing to do with .htaccess, you can put such lines in regular apache configuration file (virtualhost?) To learn more, see our tips on writing great answers. Making statements based on opinion; back them up with references or personal experience. It's the case, at least, in Apache 2.4.6. Add the port to your regex. Asking for help, clarification, or responding to other answers. Not the answer you're looking for? SetEnvIf allows you to reference HTTP request headers directly, eg "Referer". Making statements based on opinion; back them up with references or personal experience. I'm trying to implement the suggestion here: https://stackoverflow.com/a/1850482/138228. Apache: difference between "Header always set" and "Header set"? 127.0.0.1 ( %h) This is the IP address of the client (remote host) which made the request to the server. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Are the S&P 500 and Dow Jones Industrial Average securities? We will look at each of them. Examples of frauds discovered because someone tried to mimic a random sequence. Is there any reason on passenger airliners not to have a physical lock between throttles? I can't really find much on this topic outside of using regex. So : Add the relevant Origin header in your request. Using SetEnvIf (Apache <=2.2) Here's the syntax of SetEnvIf. SetEnvIf attribute regex [! So I don't know why you would like another solution. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? SetEnvIf uses Request_Protocol, but Apache Expressions use SERVER_PROTOCOL. One of the following aspects of the request: The name of an environment variable in the list of those associated with the request. But otherwise you need to use the corresponding server variable (eg. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. How to print and pipe log file at the same time? Asking for help, clarification, or responding to other answers. 1. Is there a syntax error or other error in this Apache site configuration? works all day long. Just like, SetEnvIf, you can place this If-else condition in your servers location or directory directives, or .htaccess file. The best answers are voted up and rise to the top, Not the answer you're looking for? If HostnameLookups is set to On, then the server will try to determine the hostname and log it in place of the IP address. Appealing a verdict due to the lawyers being incompetent and or failing to follow instructions? Basically, using the regex portion of SetEnvIf to extract the string, and use that to set the environment. Why do American universities have so many gen-eds? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. How to use HTML to print header and footer on every printed page of a document? Just be aware that anything put in there must be sanitised, since it comes from the remote request. What is the common header format of Python files? RewriteRule creates an environment variable that is not accessible by Allow/Deny directive . How to set up Nginx as a caching reverse proxy? https://stackoverflow.com/a/1850482/138228, https://serverfault.com/questions/136428/header-set-access-control-allow-origin-not-working-with-mod-rewrite-mod-jk. Share. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Not the answer you're looking for? The attribute specified in the first argument can be one of the following things: An HTTP request header field (see RFC2616 for more information about these); for example: Host, User-Agent, Referer, and Accept-Language.A regular expression may be used to specify a set of request headers. Then, using environment variables is the classical way of writing complex things in Apache (I mean the way to store some sort of variables). Server Fault is a question and answer site for system and network administrators. Ready to optimize your JavaScript with Rust? Does a 120cc engine burn 120cc of fuel a minute? This is a workaround for the longstanding behavior of how . Then Apache will set Access-Control-Allow-Origin header of all requests whose request header environment variable is set tocors. What I'm looking for is something like : Header set NAME = %{value_of_different_header}%, Reading answer from : https://serverfault.com/questions/136428/header-set-access-control-allow-origin-not-working-with-mod-rewrite-mod-jk. This should be documented better as a module-specific solution. Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? You can also use RewriteRule to match requests and set header dynamically. Is it just a 2.4 thing? Ready to optimize your JavaScript with Rust? Apache allows you to dynamically set request header environment variable for your website, as well as modify response headers conditionally. Apache 2.2 (, ) SSL; : Apache2.2 . canvas!1apache.htaccessapacheSetEnvIfOrigin":"IS_CORSHeadersetAccess-Control-Allow-Origin"*"env=IS_CORSmod_setenvifmod_headers. without using the bad .htaccess dynamic configuration files. Find centralized, trusted content and collaborate around the technologies you use most. How could my characters be tricked into thinking they are on Mars? The request header is set, replacing any previous header with this name setifempty The request header is set, but only if there is no previous header with this name. rev2022.12.9.43105. Heres the above example using Apache expressions, Bonus Read : How to Upgrade Apache Version in CentOS, Redhat Linux. It only takes a minute to sign up. SetenvIf is a good apache tool to read a request header, here . Stack Exchange network consists of 181 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Consult http://httpd.apache.org/docs/current/expr.html for more info about the expr= syntax. As a native speaker why is this usage of I've so awkward? But the only format specifiers available are %% (for %), %t for a timestamp, %D (idem), %{foo}e and %{foo}s for environments variables. Cooking roast potatoes with a slow cooked roast, If you see the "cross", you're on the right track. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Edit: In Apache 2.2 you should be able to do this: The following should be an equivalent to RequestHeader setIfEmpty in Apache versions <=2.4.6 (where setIfEmpty action is not supported): Thanks for contributing an answer to Server Fault! We are using this kind of configuration to grant access to one of our sites. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The value part of the Header instruction is: value may be a character string, a string containing format specifiers or a combination of both. Early mode is designed as a test/debugging aid for developers. Similarly, if you want to set header based on requested url (e.g /product/) you can use QUERY_STRING variable. There are 3 ways to dynamically set request header environment variable in Apache. If there are multiple headers of the same name, all will be removed. *)$ X_THING=$1. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. You could use this by specifying ^X-Forwarded-For$ which would iterate over the multiple occurrences of this 1 header. Asking for help, clarification, or responding to other answers. The SetEnvIf directive defines environment variables based on attributes of the request. 1 Answer. The solution for Apache 2.2.4 and below listed here, Set header in apache if it doesn't already exist, http://httpd.apache.org/docs/current/expr.html. This argument is followed by a header name, which can include the final colon, but it is not required. Using an environment variable in mod_headers set by mod_rewrite. Help us identify new roles for community members, Adding missing header in Apache HTTP response. ]env-variable[=value] [[! RequestHeader setIfEmpty X-Forwarded-For "%{noxff}e". Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? Something can be done or not a fit? Is there any reason on passenger airliners not to have a physical lock between throttles? Connect and share knowledge within a single location that is structured and easy to search. The normal mode is late, when Request Headers are set immediately before running the content generator and Response Headers just as the response is sent down the wire. This directive can replace, merge or remove HTTP response headers. Early mode is designed as a test/debugging aid for developers. Is there a verb meaning depthify (getting more depth)? I couldn't find the right way to ask google about this and found no result. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content, Detect apache reverse proxy programmatically, Apache HTTPD adding Full Hostname to Redirect - we want only path, Incorrect Access-Control-Allow-Origin header value with Apache reverse proxy and 304 from upstream service. Problem is sometimes client have others proxies on their side and the X-Forwarded-For Header wil be either duplicated or concatenated. My configuration now looks like this, and it works. We will look at each of them. Here are the steps to set Apache header conditionally for your website. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. SetEnvIf basically matches each requests attribute value with specified regex and sets matching requestss request header environment variable. mod_headers can be applied either early or late in the request. echo Request headers with this name are echoed back in the response headers. Does integrating PDOS give total charge of a system? Can I change Apache configuration based on requestHeaders? mod_headers can be applied either early or late in the request. eg. The SetEnvIf directive defines environment variables based on attributes of the request. Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company. RewriteRule . This allows. Disconnect vertical tab connector from PCB. Is this an at-all realistic configuration for a DHC-2 Beaver? I couldn't find a away of doing this without SetEnvIf but other than that just copying a different header can be done with the following, I was doing this as part of a ReverseProxy (hence using RequestHeader instead of Header) but the two appear to be interchangeable. In the above statement, an attribute can be: Bonus Read : How to Find Apache Version in Linux. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? I've also tried digging into the mod_setenvif's code but that's out of my league. Does integrating PDOS give total charge of a system? Connect and share knowledge within a single location that is structured and easy to search. Typesetting Malayalam in xelatex & lualatex gives error. The attribute specified in the first argument can be one of three things: An HTTP request header field (see RFC2616 for more information about these); for example: Host, User-Agent, Referer, and Accept-Language.A regular expression may be used to specify a set of request headers. How To Install mod_evasive to Protect Against DoS and DDoS, How To Enable mod_rewrite For Apache in CentOS, How to Enable mod_headers in Apache in Ubuntu, How to Upgrade Apache Version in CentOS, Redhat Linux, 5 Top Customer Experience Software to Grow Your Brand, HTTP Request header such as Host, User-agent,etc, Server variables such as Remote_Host, Remote_Addr, etc. Heres how to set Apache header conditionally using SetEnvIfdirective, and IF Else condition. Is there a way to read the value of a request header in Apache config? Any idea on how to handle this kind of case ? . Thus your header directive is skipped since the env variable is not set. To learn more, see our tips on writing great answers. By the way escaping slashes is not necessary in your regex. Apache Auth config settings override auth headers issued from PHP, How to allow incoming traffic based on User-Agent Header field with Apache. MOSFET is getting very hot at high frequency PWM. (note: we cannot control how our reverse proxy works, only Apache) Could that be qualified as a bug ? CGAC2022 Day 10: Help Santa sort presents! You can place the above linesin your servers location or directory directives, or .htaccess file. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? I want to avoid going into the .htaccess file and even better if I could avoid using SetEnvIf. i got the same answer from users@httpd.apache.org. Each part of this log entry is described below. Bonus Read : How to Enable mod_headers in Apache in Ubuntu, Similarly, if you want to set conditional Apache header based on requested URL (e.g /product/ ) you can use the REQUEST_URI attribute, You can also set Apache header conditionally using IF..Else directive and Apache expressions. did anything serious ever run on the speccy? How to smoothen the round border of a created buffer to make it look more natural? Connecting three parallel LED strips to the same power supply, Name of a play about the morality of prostitution (kind of), Cooking roast potatoes with a slow cooked roast. Why would Henry want to close the breach? There is some repetition between the two, however, there are differences. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? Name of a play about the morality of prostitution (kind of). Examples of frauds discovered because someone tried to mimic a random sequence. # Apache Configuration File Using `.htaccess` files slows down Apache, therefore, if you have access # to the main server config file (usually called `httpd.conf`), you should add How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? Always use Late mode in an operational server. Are defenders behind an arrow slit attackable? I determined that by stripping my .htaccess file to the bone, then adding back each section until the header controls proved to be the culprit. This isn't so hard. Thanks for contributing an answer to Stack Overflow! For some reason it doesn't like "" as a regular expression but ^$ seemed to do the trick. Are defenders behind an arrow slit attackable? Sed based on 2 words, then replace whole line with variable. Would it be possible, given current technology, ten years, and an infinite amount of money, to construct a 7,000 foot (2200 meter) aircraft carrier? The SetEnvIf directive defines environment variables based on attributes of the request. did anything serious ever run on the speccy? The header is modified just after the content handler and output filters are run, allowing outgoing headers to be modified. IIS sets http header Expires to -1, how do I override this with mod_expires, Apache proxy_http redirect to ip and set hostname. Thats it! Ready to optimize your JavaScript with Rust? By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. Are there conservative socialists in the US? The SetEnvIf directive defines environment variables based on attributes of the request. It seems that environment variables in Apache are not being treated equally when SetEnv, SetEnvIf and RewriteRule directives are used. It makes it difficult to use the former module to copy and correct the variable for use with the latter. - [E=noxff:%{REMOTE_ADDR}] But the only format specifiers available are %% (for % ), %t for a timestamp, %D (idem), % {foo}e and % {foo}s for environments variables. If there are multiple headers of the same name, all will be removed. Always use Late mode in an operational server. FREE WORLD, server environment variable debugging script, Populates HTTP_MY_ Variables with mod_setenvif variable values, Allows only if HOST Header is present in request, Set the REDIRECT_STATUS for Interpreter Security, Advanced .htaccess Tricks for Securing Sites , Sets environment variables based on attributes of the request, server config, virtual host, directory, .htaccess. I have a proxy that is injecting some headers but I want to modify it so it only sets the headers if they are not already present: In Apache 2.4.7, x86_64, Ubuntu 14.04 LTS, RequestHeader setIfEmpty X-Forwarded-For "127.0.0.1". I have found that you need the help of mod_rewrite to harvest the value. To learn more, see our tips on writing great answers. Should teachers encourage good students to help weaker ones? rev2022.12.9.43105. does not work. Then the header directive sets the header of those requests whose environment variable is cors. This is a workaround for the longstanding behavior of how many modules treat multiple occurrences. The inconsistencies in how mod_setenvif and mod_headers handle the REQUEST_URI are frustrating. The rubber protection cover does not pass through the hole in the rim. The SetEnvIf directive defines environment variables based on attributes of the request. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. ]env-variable[=value]] i will test that ASAP indeed. Compatibility: SetIfEmpty available in 2.4.7 and later, expr=value available in 2.4.10 and later. Ubiqmakes it easy to visualize data in minutes, and monitor in real-time dashboards. Module: mod_headers. Lets say you want to dynamically allow cross-origin access from a specific IP such as 245.103.193.53, then add the following lines to
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