pyCFSolver is a fork of (FlareSolver) which is a proxy server to bypass Cloudflare and DDoS-GUARD protection.
- All V3 FlareSolverr features
- Proxy Support
- Session support (Ty @furdarius & @Xefir)
- Add Docker support
pyCFSolver starts a proxy server, and it waits for user requests in an idle state using few resources. When some request arrives, it uses Selenium with the undetected-chromedriver to create a web browser (Chrome). It opens the URL with user parameters and waits until the Cloudflare challenge is solved (or timeout). The HTML code and the cookies are sent back to the user, and those cookies can be used to bypass Cloudflare using other HTTP clients.
NOTE: Web browsers consume a lot of memory. If you are running pyCFSolver on a machine with few RAM, do not make many requests at once. With each request a new browser is launched.
It is also possible to use a permanent session. However, if you use sessions, you should make sure to close them as soon as you are done using them.
Not supported yet. See manual installation.
Precompiled binaries are not currently available for v3. Please see FlareSolverr/FlareSolverr#660 for updates, or below for instructions of how to build pyCFSolver from source code.
- Install Python 3.10.
- Install Chrome or Chromium web browser.
- (Only in Linux / macOS) Install Xvfb package.
- Clone this repository and open a shell in that path.
- Run
pip install -r requirements.txtcommand to install pyCFSolver dependencies. - Run
python src/flaresolverr.pycommand to start pyCFSolver.
We provide an example Systemd unit file flaresolverr.service as reference. You have to modify the file to suit your needs: paths, user and environment variables.
Example request:
curl -L -X POST 'http://localhost:8192/v1' \
-H 'Content-Type: application/json' \
--data-raw '{
"cmd": "request.get",
"url":"http://www.google.com/",
"maxTimeout": 60000,
"proxy": {"url": "http://0.0.0.0:8888"}
}'Create a session:
curl -L -X POST 'http://localhost:8192/v1' \
-H 'Content-Type: application/json' \
--data-raw '{
"cmd": "sessions.create",
"session": "session_id_1",
"headless": true,
}'Use a session:
curl -L -X POST 'http://localhost:8192/v1' \
-H 'Content-Type: application/json' \
--data-raw '{
"cmd": "request.get",
"url":"http://www.google.com/",
"maxTimeout": 60000,
"session": "session_id_1",
"session_ttl_minutes": 10, # Time to live in minutes
"proxy": {"url": "http://0.0.0.0:8888"}
}'Destroy a session:
curl -L -X POST 'http://localhost:8192/v1' \
-H 'Content-Type: application/json' \
--data-raw '{
"cmd": "sessions.destroy",
"session": "session_id_1",
}'This will launch a new browser instance which will retain cookies until you destroy it with sessions.destroy.
This comes in handy, so you don't have to keep solving challenges over and over and you won't need to keep sending
cookies for the browser to use.
This also speeds up the requests since it won't have to launch a new browser instance for every request.
| Parameter | Notes |
|---|---|
| session | Optional. The session ID that you want to be assigned to the instance. If isn't set a random UUID will be assigned. |
| proxy | Optional, default disabled. Eg: "proxy": {"url": "http://127.0.0.1:8888"}. You must include the proxy schema in the URL: http://, socks4:// or socks5://. Authorization (username/password) is not supported. |
Returns a list of all the active sessions. More for debugging if you are curious to see how many sessions are running. You should always make sure to properly close each session when you are done using them as too many may slow your computer down.
Example response:
{
"sessions": [
"session_id_1",
"session_id_2",
"session_id_3..."
]
}This will properly shut down a browser instance and remove all files associated with it to free up resources for a new session. When you no longer need to use a session you should make sure to close it.
| Parameter | Notes |
|---|---|
| session | The session ID that you want to be destroyed. |
| Parameter | Notes |
|---|---|
| url | Mandatory |
| session | Optional. Will send the request from and existing browser instance. If one is not sent it will create a temporary instance that will be destroyed immediately after the request is completed. |
| maxTimeout | Optional, default value 60000. Max timeout to solve the challenge in milliseconds. |
| cookies | Optional. Will be used by the headless browser. Follow this format. |
| returnOnlyCookies | Optional, default false. Only returns the cookies. Response data, headers and other parts of the response are removed. |
| proxy | Optional, default disabled. Eg: "proxy": {"url": "http://127.0.0.1:8888"}. You must include the proxy schema in the URL: http://, socks4:// or socks5://. Authorization (username/password) is not supported. (When the session parameter is set, the proxy is ignored; a session specific proxy can be set in sessions.create.) |
Example response from running the curl above:
{
"solution": {
"url": "https://www.google.com/?gws_rd=ssl",
"status": 200,
"headers": {
"status": "200",
"date": "Thu, 16 Jul 2020 04:15:49 GMT",
"expires": "-1",
"cache-control": "private, max-age=0",
"content-type": "text/html; charset=UTF-8",
"strict-transport-security": "max-age=31536000",
"p3p": "CP=\"This is not a P3P policy! See g.co/p3phelp for more info.\"",
"content-encoding": "br",
"server": "gws",
"content-length": "61587",
"x-xss-protection": "0",
"x-frame-options": "SAMEORIGIN",
"set-cookie": "1P_JAR=2020-07-16-04; expires=Sat..."
},
"response":"<!DOCTYPE html>...",
"cookies": [
{
"name": "NID",
"value": "204=QE3Ocq15XalczqjuDy52HeseG3zAZuJzID3R57...",
"domain": ".google.com",
"path": "/",
"expires": 1610684149.307722,
"size": 178,
"httpOnly": true,
"secure": true,
"session": false,
"sameSite": "None"
},
{
"name": "1P_JAR",
"value": "2020-07-16-04",
"domain": ".google.com",
"path": "/",
"expires": 1597464949.307626,
"size": 19,
"httpOnly": false,
"secure": true,
"session": false,
"sameSite": "None"
}
],
"userAgent": "Windows NT 10.0; Win64; x64) AppleWebKit/5..."
},
"status": "ok",
"message": "",
"startTimestamp": 1594872947467,
"endTimestamp": 1594872949617,
"version": "1.0.0"
}This is the same as request.get but it takes one more param:
| Parameter | Notes |
|---|---|
| postData | Must be a string with application/x-www-form-urlencoded. Eg: a=b&c=d |
| Name | Default | Notes |
|---|---|---|
| LOG_LEVEL | info | Verbosity of the logging. Use LOG_LEVEL=debug for more information. |
| LOG_HTML | false | Only for debugging. If true all HTML that passes through the proxy will be logged to the console in debug level. |
| CAPTCHA_SOLVER | none | Captcha solving method. It is used when a captcha is encountered. See the Captcha Solvers section. |
| TZ | UTC | Timezone used in the logs and the web browser. Example: TZ=Europe/London. |
| HEADLESS | true | Only for debugging. To run the web browser in headless mode or visible. |
| BROWSER_TIMEOUT | 40000 | If you are experiencing errors/timeouts because your system is slow, you can try to increase this value. Remember to increase the maxTimeout parameter too. |
| TEST_URL | https://www.google.com | pyCFSolver makes a request on start to make sure the web browser is working. You can change that URL if it is blocked in your country. |
| PORT | 8191 | Listening port. You don't need to change this if you are running on Docker. |
| HOST | 0.0.0.0 | Listening interface. You don't need to change this if you are running on Docker. |
Environment variables are set differently depending on the operating system. Some examples:
- Docker: Take a look at the Docker section in this document. Environment variables can be set in the
docker-compose.ymlfile or in the Docker CLI command. - Linux: Run
export LOG_LEVEL=debugand then start pyCFSolver in the same shell. - Windows: Open
cmd.exe, runset LOG_LEVEL=debugand then start pyCFSolver in the same shell.
Sometimes CloudFlare not only gives mathematical computations and browser tests, sometimes they also require the user to
solve a captcha.
If this is the case, pyCFSolver will return the error Captcha detected but no automatic solver is configured.
pyCFSolver can be customized to solve the captcha automatically by setting the environment variable CAPTCHA_SOLVER
to the file name of one of the adapters inside the /captcha directory.
- C# implementation => https://github.com/FlareSolverr/FlareSolverrSharp