]>
Commit | Line | Data |
---|---|---|
1 | # Server configuration | |
2 | ||
3 | ||
4 | ||
5 | ## Requirements | |
6 | ||
7 | ### Operating system and web server | |
8 | ||
9 | Shaarli can be hosted on dedicated/virtual servers, or shared hosting. The smallest DigitalOcean VPS (Droplet with 1 CPU, 1 GiB RAM and 25 GiB SSD) costs about $5/month and will run any Shaarli installation without problems. | |
10 | ||
11 | You need write access to the Shaarli installation directory - you should have received instructions from your hosting provider on how to connect to the server using SSH (or FTP for shared hosts). | |
12 | ||
13 | Examples in this documentation are given for [Debian](https://www.debian.org/), a GNU/Linux distribution widely used in server environments. Please adapt them to your specific Linux distribution. | |
14 | ||
15 | ### Network and domain name | |
16 | ||
17 | Try to host the server in a region that is geographically close to your users. | |
18 | ||
19 | A **domain name** ([DNS record](https://opensource.com/article/17/4/introduction-domain-name-system-dns)) pointing to the server's public IP address is required to obtain a SSL/TLS certificate and setup HTTPS to secure client traffic to your Shaarli instance. | |
20 | ||
21 | You can obtain a domain name from a [registrar](https://en.wikipedia.org/wiki/Domain_name_registrar) ([1](https://www.ovh.co.uk/domains), [2](https://www.gandi.net/en/domain)), or from free subdomain providers ([1](https://freedns.afraid.org/)). If you don't have a domain name, please set up a private domain name ([FQDN](ttps://en.wikipedia.org/wiki/Fully_qualified_domain_name)) in your clients' [hosts files](https://en.wikipedia.org/wiki/Hosts_(file)) to access the server (direct access by IP address can result in unexpected behavior). | |
22 | ||
23 | Setup a **firewall** (using `iptables`, [ufw](https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-debian-10), [fireHOL](https://firehol.org/) or any frontend of your choice) to deny all incoming traffic except `tcp/80` and `tcp/443`, which are needed to access the web server (and any other posrts you might need, like SSH). If the server is in a private network behind a NAT, ensure these **ports are forwarded** to the server. | |
24 | ||
25 | Shaarli makes outbound HTTP/HTTPS connections to websites you bookmark to fetch page information (title, thumbnails), the server must then have access to the Internet as well, and a working DNS resolver. | |
26 | ||
27 | ||
28 | ### PHP | |
29 | ||
30 | Supported PHP versions: | |
31 | ||
32 | Version | Status | Shaarli compatibility | |
33 | :---:|:---:|:---: | |
34 | 7.3 | Supported | Yes | |
35 | 7.2 | Supported | Yes | |
36 | 7.1 | Supported | Yes | |
37 | 7.0 | EOL: 2018-12-03 | Yes (up to Shaarli 0.10.x) | |
38 | 5.6 | EOL: 2018-12-31 | Yes (up to Shaarli 0.10.x) | |
39 | 5.5 | EOL: 2016-07-10 | Yes | |
40 | 5.4 | EOL: 2015-09-14 | Yes (up to Shaarli 0.8.x) | |
41 | 5.3 | EOL: 2014-08-14 | Yes (up to Shaarli 0.8.x) | |
42 | ||
43 | Required PHP extensions: | |
44 | ||
45 | Extension | Required? | Usage | |
46 | ---|:---:|--- | |
47 | [`openssl`](http://php.net/manual/en/book.openssl.php) | requires | OpenSSL, HTTPS | |
48 | [`php-json`](http://php.net/manual/en/book.json.php) | required | configuration parsing | |
49 | [`php-simplexml`](https://www.php.net/manual/en/book.simplexml.php) | required | REST API (Slim framework) | |
50 | [`php-mbstring`](http://php.net/manual/en/book.mbstring.php) | CentOS, Fedora, RHEL, Windows, some hosting providers | multibyte (Unicode) string support | |
51 | [`php-gd`](http://php.net/manual/en/book.image.php) | optional | required to use thumbnails | |
52 | [`php-intl`](http://php.net/manual/en/book.intl.php) | optional | localized text sorting (e.g. `e->รจ->f`) | |
53 | [`php-curl`](http://php.net/manual/en/book.curl.php) | optional | using cURL for fetching webpages and thumbnails in a more robust way | |
54 | [`php-gettext`](http://php.net/manual/en/book.gettext.php) | optional | Use the translation system in gettext mode (faster) | |
55 | ||
56 | Some [plugins](Plugins.md) may require additional configuration. | |
57 | ||
58 | ||
59 | ## SSL/TLS (HTTPS) | |
60 | ||
61 | We recommend setting up [HTTPS](https://en.wikipedia.org/wiki/HTTPS) on your webserver for secure communication between clients and the server. | |
62 | ||
63 | For public-facing web servers this can be done using free SSL/TLS certificates from [Let's Encrypt](https://en.wikipedia.org/wiki/Let's_Encrypt), a non-profit certificate authority provididing free certificates. | |
64 | ||
65 | - [How to secure Apache with Let's Encrypt](https://www.digitalocean.com/community/tutorials/how-to-secure-apache-with-let-s-encrypt-on-debian-10) | |
66 | - [How to secure Nginx with Let's Encrypt](https://www.digitalocean.com/community/tutorials/how-to-secure-nginx-with-let-s-encrypt-on-debian-10) | |
67 | - [How To Use Certbot Standalone Mode to Retrieve Let's Encrypt SSL Certificates](https://www.digitalocean.com/community/tutorials/how-to-use-certbot-standalone-mode-to-retrieve-let-s-encrypt-ssl-certificates-on-debian-10). | |
68 | ||
69 | In short: | |
70 | ||
71 | ```bash | |
72 | # install certbot | |
73 | sudo apt install certbot | |
74 | ||
75 | # stop your webserver if you already have one running | |
76 | # certbot in standalone mode needs to bind to port 80 (only needed on initial generation) | |
77 | sudo systemctl stop apache2 | |
78 | sudo systemctl stop nginx | |
79 | ||
80 | # generate initial certificates | |
81 | # Let's Encrypt ACME servers must be able to access your server! port forwarding and firewall must be properly configured | |
82 | sudo certbot certonly --standalone --noninteractive --agree-tos --email "admin@shaarli.mydomain.org" -d shaarli.mydomain.org | |
83 | # this will generate a private key and certificate at /etc/letsencrypt/live/shaarli.mydomain.org/{privkey,fullchain}.pem | |
84 | ||
85 | # restart the web server | |
86 | sudo systemctl start apache2 | |
87 | sudo systemctl start nginx | |
88 | ``` | |
89 | ||
90 | If you don't want to rely on a certificate authority, or the server can only be accessed from your own network, you can also generate self-signed certificates. Not that this will generate security warnings in web browsers/clients trying to access Shaarli: | |
91 | ||
92 | - [How To Create a Self-Signed SSL Certificate for Apache](https://www.digitalocean.com/community/tutorials/how-to-create-a-self-signed-ssl-certificate-for-apache-on-debian-10) | |
93 | - [How To Create a Self-Signed SSL Certificate for Nginx](https://www.digitalocean.com/community/tutorials/how-to-create-a-self-signed-ssl-certificate-for-nginx-on-debian-10) | |
94 | ||
95 | -------------------------------------------------------------------------------- | |
96 | ||
97 | ## Examples | |
98 | ||
99 | The following examples assume a Debian-based operating system is installed. On other distributions you may have to adapt details such as package installation procedures, configuration file locations, and webserver username/group (`www-data` or `httpd` are common values). In these examples we assume the document root for your web server/virtualhost is at `/var/www/shaarli.mydomain.org/`: | |
100 | ||
101 | ```bash | |
102 | # create the document root | |
103 | sudo mkdir -p /var/www/shaarli.mydomain.org/ | |
104 | ``` | |
105 | ||
106 | You can install Shaarli at the root of your virtualhost, or in a subdirectory as well. See [Directory structure](Directory-structure) | |
107 | ||
108 | ||
109 | ### Apache | |
110 | ||
111 | ```bash | |
112 | # Install apache + mod_php and PHP modules | |
113 | sudo apt update | |
114 | sudo apt install apache2 libapache2-mod-php php-json php-mbstring php-gd php-intl php-curl php-gettext | |
115 | ||
116 | # Edit the virtualhost configuration file with your favorite editor | |
117 | sudo nano /etc/apache2/sites-available/shaarli.mydomain.org.conf | |
118 | ``` | |
119 | ||
120 | ```apache | |
121 | <VirtualHost *:80> | |
122 | ServerName shaarli.mydomain.org | |
123 | DocumentRoot /var/www/shaarli.mydomain.org/ | |
124 | ||
125 | # Log level. Possible values include: debug, info, notice, warn, error, crit, alert, emerg. | |
126 | LogLevel warn | |
127 | # Log file locations | |
128 | ErrorLog /var/log/apache2/error.log | |
129 | CustomLog /var/log/apache2/access.log combined | |
130 | ||
131 | # Redirect HTTP requests to HTTPS | |
132 | RewriteEngine on | |
133 | RewriteRule ^.well-known/acme-challenge/ - [L] | |
134 | # except for Let's Encrypt ACME challenge requests | |
135 | RewriteCond %{HTTP_HOST} =shaarli.mydomain.org | |
136 | RewriteRule ^ https://shaarli.mydomain.org%{REQUEST_URI} [END,NE,R=permanent] | |
137 | </VirtualHost> | |
138 | ||
139 | <VirtualHost *:443> | |
140 | ServerName shaarli.mydomain.org | |
141 | DocumentRoot /var/www/shaarli.mydomain.org/ | |
142 | ||
143 | # Log level. Possible values include: debug, info, notice, warn, error, crit, alert, emerg. | |
144 | LogLevel warn | |
145 | # Log file locations | |
146 | ErrorLog /var/log/apache2/error.log | |
147 | CustomLog /var/log/apache2/access.log combined | |
148 | ||
149 | # SSL/TLS configuration (for Let's Encrypt certificates) | |
150 | SSLEngine on | |
151 | SSLCertificateFile /etc/letsencrypt/live/shaarli.mydomain.org/fullchain.pem | |
152 | SSLCertificateKeyFile /etc/letsencrypt/live/shaarli.mydomain.org/privkey.pem | |
153 | ||
154 | # Let's Encrypt settings from https://github.com/certbot/certbot/blob/master/certbot-apache/certbot_apache/_internal/tls_configs/current-options-ssl-apache.conf | |
155 | SSLProtocol all -SSLv2 -SSLv3 -TLSv1 -TLSv1.1 | |
156 | SSLCipherSuite ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384 | |
157 | SSLHonorCipherOrder off | |
158 | SSLSessionTickets off | |
159 | SSLOptions +StrictRequire | |
160 | ||
161 | # SSL/TLS configuration (for self-signed certificates) | |
162 | #SSLEngine on | |
163 | #SSLCertificateFile /etc/ssl/certs/ssl-cert-snakeoil.pem | |
164 | #SSLCertificateKeyFile /etc/ssl/private/ssl-cert-snakeoil.key | |
165 | ||
166 | # Optional, log PHP errors, useful for debugging | |
167 | #php_flag log_errors on | |
168 | #php_flag display_errors on | |
169 | #php_value error_reporting 2147483647 | |
170 | #php_value error_log /var/log/apache2/shaarli-php-error.log | |
171 | ||
172 | <Directory /var/www/shaarli.mydomain.org/> | |
173 | # Required for .htaccess support | |
174 | AllowOverride All | |
175 | Order allow,deny | |
176 | Allow from all | |
177 | </Directory> | |
178 | ||
179 | <LocationMatch "/\."> | |
180 | # Prevent accessing dotfiles | |
181 | RedirectMatch 404 ".*" | |
182 | </LocationMatch> | |
183 | ||
184 | <LocationMatch "\.(?:ico|css|js|gif|jpe?g|png)$"> | |
185 | # allow client-side caching of static files | |
186 | Header set Cache-Control "max-age=2628000, public, must-revalidate, proxy-revalidate" | |
187 | </LocationMatch> | |
188 | ||
189 | # serve the Shaarli favicon from its custom location | |
190 | Alias favicon.ico /var/www/shaarli.mydomain.org/images/favicon.ico | |
191 | ||
192 | </VirtualHost> | |
193 | ``` | |
194 | ||
195 | ```bash | |
196 | # Enable the virtualhost | |
197 | sudo a2ensite shaarli | |
198 | ||
199 | # mod_ssl must be enabled to use TLS/SSL certificates | |
200 | # https://httpd.apache.org/docs/current/mod/mod_ssl.html | |
201 | sudo a2enmod ssl | |
202 | ||
203 | # mod_rewrite must be enabled to use the REST API | |
204 | # https://httpd.apache.org/docs/current/mod/mod_rewrite.html | |
205 | sudo a2enmod rewrite | |
206 | ||
207 | # mod_version must only be enabled if you use Apache 2.2 or lower | |
208 | # https://httpd.apache.org/docs/current/mod/mod_version.html | |
209 | # sudo a2enmod version | |
210 | ||
211 | # restart the apache service | |
212 | systemctl restart apache | |
213 | ``` | |
214 | ||
215 | See [How to install the Apache web server](https://www.digitalocean.com/community/tutorials/how-to-install-the-apache-web-server-on-debian-10) for a complete guide. | |
216 | ||
217 | ### Nginx | |
218 | ||
219 | This examples uses nginx and the [PHP-FPM](https://www.digitalocean.com/community/tutorials/how-to-install-linux-nginx-mariadb-php-lemp-stack-on-debian-10#step-3-%E2%80%94-installing-php-for-processing) PHP interpreter. Nginx and PHP-FPM must be running using the same user and group, here we assume the user/group to be `www-data:www-data`. | |
220 | ||
221 | ||
222 | ```bash | |
223 | # install nginx and php-fpm | |
224 | sudo apt update | |
225 | sudo apt install nginx php-fpm | |
226 | ||
227 | # Edit the virtualhost configuration file with your favorite editor | |
228 | sudo nano /etc/nginx/sites-available/shaarli.mydomain.org | |
229 | ``` | |
230 | ||
231 | ```nginx | |
232 | server { | |
233 | listen 80; | |
234 | server_name shaarli.mydomain.org; | |
235 | ||
236 | # redirect all plain HTTP requests to HTTPS | |
237 | return 301 https://shaarli.mydomain.org$request_uri; | |
238 | } | |
239 | ||
240 | server { | |
241 | listen 443 ssl; | |
242 | server_name shaarli.mydomain.org; | |
243 | root /var/www/shaarli.mydomain.org; | |
244 | ||
245 | # log file locations | |
246 | # combined log format prepends the virtualhost/domain name to log entries | |
247 | access_log /var/log/nginx/access.log combined; | |
248 | error_log /var/log/nginx/error.log; | |
249 | ||
250 | # paths to private key and certificates for SSL/TLS | |
251 | ssl_certificate /etc/ssl/shaarli.mydomain.org.crt; | |
252 | ssl_certificate_key /etc/ssl/private/shaarli.mydomain.org.key; | |
253 | ||
254 | # Let's Encrypt SSL settings from https://github.com/certbot/certbot/blob/master/certbot-nginx/certbot_nginx/_internal/tls_configs/options-ssl-nginx.conf | |
255 | ssl_session_cache shared:le_nginx_SSL:10m; | |
256 | ssl_session_timeout 1440m; | |
257 | ssl_session_tickets off; | |
258 | ssl_protocols TLSv1.2 TLSv1.3; | |
259 | ssl_prefer_server_ciphers off; | |
260 | ssl_ciphers "ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384"; | |
261 | ||
262 | # increase the maximum file upload size if needed: by default nginx limits file upload to 1MB (413 Entity Too Large error) | |
263 | client_max_body_size 100m; | |
264 | ||
265 | # relative path to shaarli from the root of the webserver | |
266 | location / { | |
267 | # default index file when no file URI is requested | |
268 | index index.php; | |
269 | try_files $uri /index.php$is_args$args; | |
270 | } | |
271 | ||
272 | location ~ (index)\.php$ { | |
273 | try_files $uri =404; | |
274 | # slim API - split URL path into (script_filename, path_info) | |
275 | fastcgi_split_path_info ^(.+\.php)(/.+)$; | |
276 | # pass PHP requests to PHP-FPM | |
277 | fastcgi_pass unix:/var/run/php-fpm/php-fpm.sock; | |
278 | fastcgi_index index.php; | |
279 | include fastcgi.conf; | |
280 | } | |
281 | ||
282 | location ~ \.php$ { | |
283 | # deny access to all other PHP scripts | |
284 | # disable this if you host other PHP applications on the same virtualhost | |
285 | deny all; | |
286 | } | |
287 | ||
288 | location ~ /\. { | |
289 | # deny access to dotfiles | |
290 | deny all; | |
291 | } | |
292 | ||
293 | location ~ ~$ { | |
294 | # deny access to temp editor files, e.g. "script.php~" | |
295 | deny all; | |
296 | } | |
297 | ||
298 | location = /favicon.ico { | |
299 | # serve the Shaarli favicon from its custom location | |
300 | alias /var/www/shaarli/images/favicon.ico; | |
301 | } | |
302 | ||
303 | # allow client-side caching of static files | |
304 | location ~* \.(?:ico|css|js|gif|jpe?g|png)$ { | |
305 | expires max; | |
306 | add_header Cache-Control "public, must-revalidate, proxy-revalidate"; | |
307 | # HTTP 1.0 compatibility | |
308 | add_header Pragma public; | |
309 | } | |
310 | ||
311 | } | |
312 | ``` | |
313 | ||
314 | ```bash | |
315 | # enable the configuration/virtualhost | |
316 | sudo ln -s /etc/nginx/sites-available/shaarli.mydomain.org /etc/nginx/sites-enabled/shaarli.mydomain.org | |
317 | # reload nginx configuration | |
318 | sudo systemctl reload nginx | |
319 | ``` | |
320 | ||
321 | See [How to install the Nginx web server](https://www.digitalocean.com/community/tutorials/how-to-install-nginx-on-debian-10) for a complete guide. | |
322 | ||
323 | ||
324 | ## Reverse proxies | |
325 | ||
326 | If Shaarli is hosted on a server behind a [reverse proxy](https://en.wikipedia.org/wiki/Reverse_proxy) (i.e. there is a proxy server between clients and the web server hosting Shaarli), configure it accordingly. See [Reverse proxy](Reverse-proxy.md) configuration. | |
327 | ||
328 | ||
329 | ||
330 | ## Allow import of large browser bookmarks export | |
331 | ||
332 | Web browser bookmark exports can be large due to the presence of base64-encoded images and favicons/long subfolder names. Edit the PHP configuration file. | |
333 | ||
334 | - Apache: `/etc/php/<PHP_VERSION>/apache2/php.ini` | |
335 | - Nginx + PHP-FPM: `/etc/php/<PHP_VERSION>/fpm/php.ini` (in addition to `client_max_body_size` in the [Nginx configuration](#nginx)) | |
336 | ||
337 | ```ini | |
338 | [...] | |
339 | # (optional) increase the maximum file upload size: | |
340 | post_max_size = 100M | |
341 | [...] | |
342 | # (optional) increase the maximum file upload size: | |
343 | upload_max_filesize = 100M | |
344 | ``` | |
345 | ||
346 | To verify PHP settings currently set on the server, create a `phpinfo.php` in your webserver's document root | |
347 | ||
348 | ```bash | |
349 | # example | |
350 | echo '<?php phpinfo(); ?>' | sudo tee /var/www/shaarli.mydomain.org/phpinfo.php | |
351 | #give read-only access to this file to the webserver user | |
352 | sudo chown www-data:root /var/www/shaarli.mydomain.org/phpinfo.php | |
353 | sudo chmod 0400 /var/www/shaarli.mydomain.org/phpinfo.php | |
354 | ``` | |
355 | ||
356 | Access the file from a web browser (eg. <https://shaarli.mydomain.org/phpinfo.php> and look at the _Loaded Configuration File_ and _Scan this dir for additional .ini files_ entries | |
357 | ||
358 | It is recommended to remove the `phpinfo.php` when no longer needed as it publicly discloses details about your webserver configuration. | |
359 | ||
360 | ||
361 | ## Robots and crawlers | |
362 | ||
363 | To opt-out of indexing your Shaarli instance by search engines, create a `robots.txt` file at the root of your virtualhost: | |
364 | ||
365 | ``` | |
366 | User-agent: * | |
367 | Disallow: / | |
368 | ``` | |
369 | ||
370 | By default Shaarli already disallows indexing of your local copy of the documentation by default, using `<meta name="robots">` HTML tags. Your Shaarli instance may still be indexed by various robots on the public Internet, that do not respect this header or the robots standard. | |
371 | ||
372 | - [Robots exclusion standard](https://en.wikipedia.org/wiki/Robots_exclusion_standard) | |
373 | - [Introduction to robots.txt](https://support.google.com/webmasters/answer/6062608?hl=en) | |
374 | - [Robots meta tag, data-nosnippet, and X-Robots-Tag specifications](https://developers.google.com/search/reference/robots_meta_tag) | |
375 | - [About robots.txt](http://www.robotstxt.org) | |
376 | - [About the robots META tag](https://www.robotstxt.org/meta.html) | |
377 | ||
378 | ||
379 | ## Fail2ban | |
380 | ||
381 | [fail2ban](http://www.fail2ban.org/wiki/index.php/Main_Page) is an intrusion prevention framework that reads server (Apache, SSH, etc.) and uses `iptables` profiles to block brute-force attempts. You need to create a filter to detect shaarli login failures in logs, and a jail configuation to configure the behavior when failed login attempts are detected: | |
382 | ||
383 | ```ini | |
384 | # /etc/fail2ban/filter.d/shaarli-auth.conf | |
385 | [INCLUDES] | |
386 | before = common.conf | |
387 | [Definition] | |
388 | failregex = \s-\s<HOST>\s-\sLogin failed for user.*$ | |
389 | ignoreregex = | |
390 | ``` | |
391 | ||
392 | ```ini | |
393 | # /etc/fail2ban/jail.local | |
394 | [shaarli-auth] | |
395 | enabled = true | |
396 | port = https,http | |
397 | filter = shaarli-auth | |
398 | logpath = /var/www/shaarli.mydomain.org/data/log.txt | |
399 | # allow 3 login attempts per IP address | |
400 | # (over a period specified by findtime = in /etc/fail2ban/jail.conf) | |
401 | maxretry = 3 | |
402 | # permanently ban the IP address after reaching the limit | |
403 | bantime = -1 | |
404 | ``` | |
405 | ||
406 | #### References | |
407 | ||
408 | - [Apache/PHP - error log per VirtualHost - StackOverflow](http://stackoverflow.com/q/176) | |
409 | - [Apache - PHP: php_value vs php_admin_value and the use of php_flag explained](https://ma.ttias.be/php-php_value-vs-php_admin_value-and-the-use-of-php_flag-explained/) | |
410 | - [Server-side TLS (Apache) - Mozilla](https://wiki.mozilla.org/Security/Server_Side_TLS#Apache) | |
411 | - [Nginx Beginner's guide](http://nginx.org/en/docs/beginners_guide.html) | |
412 | - [Nginx ngx_http_fastcgi_module](http://nginx.org/en/docs/http/ngx_http_fastcgi_module.html) | |
413 | - [Nginx Pitfalls](http://wiki.nginx.org/Pitfalls) | |
414 | - [Nginx PHP configuration examples - Karl Blessing](http://kbeezie.com/nginx-configuration-examples/) | |
415 | - [Apache 2.4 documentation](https://httpd.apache.org/docs/2.4/) | |
416 | - [Apache mod_proxy](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html) | |
417 | - [Apache Reverse Proxy Request Headers](https://httpd.apache.org/docs/2.4/mod/mod_proxy.html#x-headers) | |
418 | - [HAProxy documentation](https://cbonte.github.io/haproxy-dconv/) | |
419 | - [Nginx documentation](https://nginx.org/en/docs/) | |
420 | - [`X-Forwarded-Proto`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Proto) | |
421 | - [`X-Forwarded-Host`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-Host) | |
422 | - [`X-Forwarded-For`](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/X-Forwarded-For) | |
423 | - [Server-side TLS (Nginx) - Mozilla](https://wiki.mozilla.org/Security/Server_Side_TLS#Nginx) | |
424 | - [How to Create Self-Signed SSL Certificates with OpenSSL](http://www.xenocafe.com/tutorials/linux/centos/openssl/self_signed_certificates/index.php) | |
425 | - [How do I create my own Certificate Authority?](https://workaround.org/certificate-authority) | |
426 | - [Travis configuration](https://github.com/shaarli/Shaarli/blob/master/.travis.yml) | |
427 | - [PHP: Supported versions](http://php.net/supported-versions.php) | |
428 | - [PHP: Unsupported versions (EOL/End-of-life)](http://php.net/eol.php) | |
429 | - [PHP 7 Changelog](http://php.net/ChangeLog-7.php) | |
430 | - [PHP 5 Changelog](http://php.net/ChangeLog-5.php) | |
431 | - [PHP: Bugs](https://bugs.php.net/) | |
432 | - [Transport Layer Security](https://en.wikipedia.org/wiki/Transport_Layer_Security) | |
433 | - Hosting providers: [DigitalOcean](https://www.digitalocean.com/) ([1](https://www.digitalocean.com/docs/droplets/overview/), [2](https://www.digitalocean.com/pricing/), [3](https://www.digitalocean.com/docs/droplets/how-to/create/), [How to Add SSH Keys to Droplets](https://www.digitalocean.com/docs/droplets/how-to/add-ssh-keys/), [4](https://www.digitalocean.com/community/tutorials/initial-server-setup-with-debian-8), [5](https://www.digitalocean.com/community/tutorials/an-introduction-to-securing-your-linux-vps)), [Gandi](https://www.gandi.net/en), [OVH](https://www.ovh.co.uk/), [RackSpace](https://www.rackspace.com/), etc. | |
434 | ||
435 |