Asking for help, clarification, or responding to other answers. So I don't know why you would like another solution. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Is it cheating if the proctor gives a student the answer key by mistake and the student doesn't report it? The attribute specified in the first argument can be one of four 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 Apache will set Access-Control-Allow-Origin header of all requests whose request header environment variable is set tocors. This is a workaround for the longstanding behavior of how . Any idea on how to handle this kind of case ? The inconsistencies in how mod_setenvif and mod_headers handle the REQUEST_URI are frustrating. A small bolt/nut came off my mtn bike while washing it, can someone help me identify it? This allows. Are the S&P 500 and Dow Jones Industrial Average securities? Thanks. eg. unset The request header of this name is removed, if it exists. I couldn't find the right way to ask google about this and found no result. Making statements based on opinion; back them up with references or personal experience. at the moment my host implemented http/2 my header control section blew up the server. Thats it! - [E=noxff:%{REMOTE_ADDR}] Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Disconnect vertical tab connector from PCB. We will look at each of them. To learn more, see our tips on writing great answers. The SetEnvIf directive defines environment variables based on attributes of the request. 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. *)$ X_THING=$1. 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. SetEnvIf attribute regex [! SetEnvIf thing ^ (. My current Apache 2.2 SetEnvIf Remote_Addr ^107\.20\.0\.0\/14 bad_range . Apache allows you to dynamically set request header environment variable for your website, as well as modify response headers conditionally. Are defenders behind an arrow slit attackable? The header is modified just after the content handler and output filters are run, allowing outgoing headers to be modified. I want to avoid going into the .htaccess file and even better if I could avoid using SetEnvIf. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Add the port to your regex. Heres the above example using Apache expressions, Bonus Read : How to Upgrade Apache Version in CentOS, Redhat Linux. 1 Answer. without using the bad .htaccess dynamic configuration files. Find centralized, trusted content and collaborate around the technologies you use most. Apache Auth config settings override auth headers issued from PHP, How to allow incoming traffic based on User-Agent Header field with Apache. This is a workaround for the longstanding behavior of how many modules treat multiple occurrences. 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. Is there any reason on passenger airliners not to have a physical lock between throttles? Are defenders behind an arrow slit attackable? Ready to optimize your JavaScript with Rust? One of the following aspects of the request: The name of an environment variable in the list of those associated with the request. Share. Is there a syntax error or other error in this Apache site configuration? In my case, I want to limit access based on query string but SetEnvIf does not have that attribute to test against. Name of a play about the morality of prostitution (kind of). 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. Help us identify new roles for community members, Adding missing header in Apache HTTP response. Connect and share knowledge within a single location that is structured and easy to search. Early mode is designed as a test/debugging aid for developers. Here are the steps to set Apache header conditionally for your website. 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 or context, or .htaccess file. Note : this question was sent to users@httpd.apache.org mailing list too. However, you will need to enable Apachemod_rewritemodule to use rewrite rule. If you're a seasoned HTTPD admin or an attentive reader you may have spotted the problem or at least noticed that something is wrong. It's the case, at least, in Apache 2.4.6. How to smoothen the round border of a created buffer to make it look more natural? I'm trying to implement the suggestion here: https://stackoverflow.com/a/1850482/138228. There are 3 ways to dynamically set request header environment variable in Apache. 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. If there are multiple headers of the same name, all will be removed. In the above code, RewriteRule will match all URLs starting with /product/ and set their environment variable to cors. As a native speaker why is this usage of I've so awkward? Is it just a 2.4 thing? Consult http://httpd.apache.org/docs/current/expr.html for more info about the expr= syntax. 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. Why would Henry want to close the breach? 1. Something can be done or not a fit? MOSFET is getting very hot at high frequency PWM. You could use this by specifying ^X-Forwarded-For$ which would iterate over the multiple occurrences of this 1 header. Does integrating PDOS give total charge of a system? rev2022.12.9.43105. The SetEnvIf directive defines environment variables based on attributes of the request. Just be aware that anything put in there must be sanitised, since it comes from the remote request. Is there a way to read the value of a request header in Apache config? To learn more, see our tips on writing great answers. How to print and pipe log file at the same time? header may be a regular expression. Sed based on 2 words, then replace whole line with variable. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. But the only format specifiers available are %% (for %), %t for a timestamp, %D (idem), %{foo}e and %{foo}s for environments variables. SetenvIf is a good apache tool to read a request header, here reading the Origin header. Thanks for contributing an answer to Stack Overflow! There is some repetition between the two, however, there are differences. Typesetting Malayalam in xelatex & lualatex gives error. Why do American universities have so many gen-eds? Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? But otherwise you need to use the corresponding server variable (eg. Making statements based on opinion; back them up with references or personal experience. What is the common header format of Python files? all of which exist in the parallel . Making statements based on opinion; back them up with references or personal experience. The SetEnvIf directive defines environment variables based on attributes of the request. Should teachers encourage good students to help weaker ones? How did muzzle-loaded rifled artillery solve the problems of the hand-held rifle? You could use this by specifying ^X-Forwarded-For$ which would iterate over the multiple occurrences of this 1 header. Similarly, if you want to set header based on requested url (e.g /product/) you can use QUERY_STRING variable. My configuration now looks like this, and it works. 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! Are there conservative socialists in the US? SetEnvIf allows you to reference HTTP request headers directly, eg "Referer". Always use Late mode in an operational server. However if one tries to use a dynamic value, RequestHeader setIfEmpty X-Forwarded-For "%{REMOTE_ADDR}e". Examples of frauds discovered because someone tried to mimic a random sequence. Ready to optimize your JavaScript with Rust? I have found that you need the help of mod_rewrite to harvest the value. 127.0.0.1 ( %h) This is the IP address of the client (remote host) which made the request to the server. Should teachers encourage good students to help weaker ones? To learn more, see our tips on writing great answers. Is there a verb meaning depthify (getting more depth)? mod_headers can be applied either early or late in the request. Now you can dynamically set Apache headers conditionally for your websites & applications. It seems that environment variables in Apache are not being treated equally when SetEnv, SetEnvIf and RewriteRule directives are used. canvas!1apache.htaccessapacheSetEnvIfOrigin":"IS_CORSHeadersetAccess-Control-Allow-Origin"*"env=IS_CORSmod_setenvifmod_headers. The value part of the Header instruction is: value may be a character string, a string containing format specifiers or a combination of both. There are 3 ways to dynamically set request header environment variable in Apache. IIS sets http header Expires to -1, how do I override this with mod_expires, Apache proxy_http redirect to ip and set hostname. (note: we cannot control how our reverse proxy works, only Apache) Could that be qualified as a bug ? So : Add the relevant Origin header in your request. 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. By the way escaping slashes is not necessary in your regex. Apache: difference between "Header always set" and "Header set"? Examples of frauds discovered because someone tried to mimic a random sequence. Heres how to set Apache header conditionally using SetEnvIfdirective, and IF Else condition. We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. I can't really find much on this topic outside of using regex. works all day long. Thus your header directive is skipped since the env variable is not set. RewriteRule creates an environment variable that is not accessible by Allow/Deny directive . https://stackoverflow.com/a/1850482/138228, https://serverfault.com/questions/136428/header-set-access-control-allow-origin-not-working-with-mod-rewrite-mod-jk. Why does the distance from light to subject affect exposure (inverse square law) while from subject to lens does not? Does a 120cc engine burn 120cc of fuel a minute? Available in 2.4.7 and later. Asking for help, clarification, or responding to other answers. The solution for Apache 2.2.4 and below listed here Header append Access-Control-Allow-Origin "" Header edit Access-Control-Allow-Origin "^$" "*" may have a side effect of appending , to a non-empty header value because it's how append action works. Cooking roast potatoes with a slow cooked roast, If you see the "cross", you're on the right track. 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. Can I change Apache configuration based on requestHeaders? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. But this has nothing to do with .htaccess, you can put such lines in regular apache configuration file (virtualhost?) 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. Connect and share knowledge within a single location that is structured and easy to search. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. 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. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Should I give a brutally honest feedback on course evaluations? 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. 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". By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. did anything serious ever run on the speccy? Basically, using the regex portion of SetEnvIf to extract the string, and use that to set the environment. You can place the above linesin your servers location or directory directives, or .htaccess file. Problem is sometimes client have others proxies on their side and the X-Forwarded-For Header wil be either duplicated or concatenated. But the only format specifiers available are %% (for % ), %t for a timestamp, %D (idem), % {foo}e and % {foo}s for environments variables. rev2022.12.9.43105. SetEnvIf basically matches each requests attribute value with specified regex and sets matching requestss request header environment variable. Using SetEnvIf (Apache <=2.2) Here's the syntax of SetEnvIf. The value part of the Header instruction is: value may be a character string, a string containing format specifiers or a combination of both. This directive can replace, merge or remove HTTP response headers. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? 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? How to say "patience" in latin in the modern sense of "virtue of waiting or being able to wait"? SSL [hint: SSLProtocol] Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. ]env-variable[=value]] Then the header directive sets the header of those requests whose environment variable is cors. If SetEnvIf sees regex-like characters in the first argument, it will go into a mode where it iterates over all headers that match the regex until there's a match. This argument is followed by a header name, which can include the final colon, but it is not required. How could my characters be tricked into thinking they are on Mars? For some reason it doesn't like "" as a regular expression but ^$ seemed to do the trick. Drupal CMS pdfword .htaccess pdfurl Drupal .hta Documentation is unclear about this behavior. does not work. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. RewriteRule . mod_headers can be applied either early or late in the request. How does the Chameleon's Arcane/Divine focus interact with magic item crafting? If there are multiple headers of the same name, all will be removed. CGAC2022 Day 10: Help Santa sort presents! Always use Late mode in an operational server. If SetEnvIf sees regex-like characters in the first argument, it will go into a mode where it iterates over all headers that match the regex until there's a match. Precision : CentOS 6, Apache 2.2.15 latest patch version. Apache 2.2 (, ) SSL; : Apache2.2 . Not the answer you're looking for? Sed based on 2 words, then replace whole line with variable. SetenvIf is a good apache tool to read a request header, here . Why is Singapore considered to be a dictatorial regime and a multi-party democracy at the same time? Ubiqmakes it easy to visualize data in minutes, and monitor in real-time dashboards. Does integrating PDOS give total charge of a system? If HostnameLookups is set to On, then the server will try to determine the hostname and log it in place of the IP address. Not the answer you're looking for? 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. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. How to set up Nginx as a caching reverse proxy? This isn't so hard. The response header of this name is removed, if it exists. Is this an at-all realistic configuration for a DHC-2 Beaver? I've also tried digging into the mod_setenvif's code but that's out of my league. When would I give a checkpoint to my D&D party that they can return to if they die? By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. did anything serious ever run on the speccy? Why did the Council of Elrond debate hiding or sending the Ring away, if Sauron wins eventually in that scenario? To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Why do American universities have so many gen-eds? SetEnvIf uses Request_Protocol, but Apache Expressions use SERVER_PROTOCOL. i will test that ASAP indeed. 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. Compatibility: SetIfEmpty available in 2.4.7 and later, expr=value available in 2.4.10 and later. Sorted by: 0. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. How to use HTML to print header and footer on every printed page of a document? In the above statement, an attribute can be: Bonus Read : How to Find Apache Version in Linux. Just like, SetEnvIf, you can place this If-else condition in your servers location or directory directives, or .htaccess file. echo Request headers with this name are echoed back in the response headers. i got the same answer from users@httpd.apache.org. 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. ]env-variable[=value] [[! Does a 120cc engine burn 120cc of fuel a minute? It makes it difficult to use the former module to copy and correct the variable for use with the latter. Server Fault is a question and answer site for system and network administrators. 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. Appealing a verdict due to the lawyers being incompetent and or failing to follow instructions? 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. We will look at each of them. The SetEnvIf directive defines environment variables based on attributes of the request. 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. The rubber protection cover does not pass through the hole in the rim. Each part of this log entry is described below. Ready to optimize your JavaScript with Rust? Connect and share knowledge within a single location that is structured and easy to search. 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. Thanks for contributing an answer to Stack Overflow! rev2022.12.9.43105. This should be documented better as a module-specific solution. Asking for help, clarification, or responding to other answers. . In the above statements, SetEnvIf checks the Remote_addr request attribute and if it matches the specified IP then sets request header environment variable as cors. Early mode is designed as a test/debugging aid for developers. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. I seem to be having some problems with that in apache 2.2.24. Module: mod_headers. RequestHeader setIfEmpty X-Forwarded-For "%{noxff}e". We are using this kind of configuration to grant access to one of our sites. 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. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? Why did the Council of Elrond debate hiding or sending the Ring away, if Sauron wins eventually in that scenario? Using an environment variable in mod_headers set by mod_rewrite. Is this an at-all realistic configuration for a DHC-2 Beaver? Try itToday! The best answers are voted up and rise to the top, Not the answer you're looking for? - Is there any reason on passenger airliners not to have a physical lock between throttles? You can also use RewriteRule to match requests and set header dynamically. # 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 Can a prospective pilot be negated their certification because of too big/small hands? Is there a verb meaning depthify (getting more depth)? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Then, using environment variables is the classical way of writing complex things in Apache (I mean the way to store some sort of variables). Here are the steps to set Apache header conditionally for your website. Find centralized, trusted content and collaborate around the technologies you use most. Indeed, there is another reverse proxy in front of this Apache server so all clients will have the header. The SetEnvIf directive defines environment variables based on attributes of the request. It only takes a minute to sign up. 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