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README.md

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+# cache\_warmer
+
+This tool is indented to be used to warm-up HTTP caches, e.g. services like [nginx](http://nginx.org/).
+
+# Comparison to other tools
+
+While most tools in this area are designed to apply a certain load to a web server (often for a specified time), cache\_warmer is designed to explicitly `GET` a set of URLs from a file to warm-up a cache.
+
+
+# Usage
+
+Warm-up URLs from a file using a mobile User-Agent
+
+```bash
+$ cache_warmer --mobile urls.txt
+
+Spawning 4 threads to warm cache with 10000 URIs
+10000 / 10000 [===================================================================] 100.00 % 133.99/s
+Processed 10000 URLs
+
+X-Cache-Status header statistics:
+        Miss: 8991
+        Hit: 1009
+
+HTTP Status Code statistics:
+        Ok: 9850
+        NotFound: 150
+
+Total time taken: 450.002s
+```
+
+
+# Features
+
+## Multi-Threaded
+
+cache\_warmer is multi-threaded. Threads can be specified using the `--threads` option.
+
+
+## HTTP keep-alive
+
+It uses keep-alive by default, which can be disabled with `--no-keep-alive`.
+
+
+## Captcha detection
+
+It supports a `--captcha-string` option, which scans the response body for certain strings to detect (and abort) when running into e.g. captchas.
+
+
+## Base URI
+
+If your URL file only contains the base URL (like `/products/spoons`), you can add a `--base-uri` to prepend the host and scheme, e.g. `--base-uri https://example.com`
+
+
+## Request delay
+
+Outgoing requests can be toned down with the `--delay` flag.
+
+
+## X-Cache-Status header support
+
+If your backend sets the `X-Cache-Status` header, you'll get nice statistics about your cache hit rates at the end of the run.
+
+When using [nginx](http://nginx.org), such a header can be added with this directive:
+
+```nginx
+add_header X-Cache-Status $upstream_cache_status;
+```
+
+## Custom User-Agent
+
+cache\_warmer defaults to a Googlebot-like User-Agent. You can use the corresponding mobile User-Agent when specifying the `--mobile` flag.
+
+In case you need a custom User-Agent, you can set it with `--user-agent 'Your-User-Agent'`.
+
+## Cookie support
+
+Attach arbitrary cookies with the `--cookie key=value` option.
+
+
+# Compile
+
+```bash
+# Compile locally
+cargo build --release
+
+# Cross compile to Linux using Docker
+docker-compose up
+```
+
+
+# License and Author
+
+Authors: Chris Aumann
+
+```
+Copyright (C) 2017  Chris Aumann
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+```