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rclone/docs/content/commands/rclone_serve_webdav.md
Nick Craig-Wood 102a38bb95 docs: restore lost VFS poll interval docs 
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---
date: 2020-02-10T14:59:49Z
title: "rclone serve webdav"
slug: rclone_serve_webdav
url: /commands/rclone_serve_webdav/
# autogenerated - DO NOT EDIT, instead edit the source code in cmd/serve/webdav/ and as part of making a release run "make commanddocs"
---
## rclone serve webdav
Serve remote:path over webdav.
### Synopsis
rclone serve webdav implements a basic webdav server to serve the
remote over HTTP via the webdav protocol. This can be viewed with a
webdav client, through a web browser, or you can make a remote of
type webdav to read and write it.
### Webdav options
#### --etag-hash
This controls the ETag header. Without this flag the ETag will be
based on the ModTime and Size of the object.
If this flag is set to "auto" then rclone will choose the first
supported hash on the backend or you can use a named hash such as
"MD5" or "SHA-1".
Use "rclone hashsum" to see the full list.
### Server options
Use --addr to specify which IP address and port the server should
listen on, eg --addr 1.2.3.4:8000 or --addr :8080 to listen to all
IPs. By default it only listens on localhost. You can use port
:0 to let the OS choose an available port.
If you set --addr to listen on a public or LAN accessible IP address
then using Authentication is advised - see the next section for info.
--server-read-timeout and --server-write-timeout can be used to
control the timeouts on the server. Note that this is the total time
for a transfer.
--max-header-bytes controls the maximum number of bytes the server will
accept in the HTTP header.
--baseurl controls the URL prefix that rclone serves from. By default
rclone will serve from the root. If you used --baseurl "/rclone" then
rclone would serve from a URL starting with "/rclone/". This is
useful if you wish to proxy rclone serve. Rclone automatically
inserts leading and trailing "/" on --baseurl, so --baseurl "rclone",
--baseurl "/rclone" and --baseurl "/rclone/" are all treated
identically.
#### Authentication
By default this will serve files without needing a login.
You can either use an htpasswd file which can take lots of users, or
set a single username and password with the --user and --pass flags.
Use --htpasswd /path/to/htpasswd to provide an htpasswd file. This is
in standard apache format and supports MD5, SHA1 and BCrypt for basic
authentication. Bcrypt is recommended.
To create an htpasswd file:
touch htpasswd
htpasswd -B htpasswd user
htpasswd -B htpasswd anotherUser
The password file can be updated while rclone is running.
Use --realm to set the authentication realm.
#### SSL/TLS
By default this will serve over http. If you want you can serve over
https. You will need to supply the --cert and --key flags. If you
wish to do client side certificate validation then you will need to
supply --client-ca also.
--cert should be a either a PEM encoded certificate or a concatenation
of that with the CA certificate. --key should be the PEM encoded
private key and --client-ca should be the PEM encoded client
certificate authority certificate.
### Directory Cache
Using the `--dir-cache-time` flag, you can set how long a
directory should be considered up to date and not refreshed from the
backend. Changes made locally in the mount may appear immediately or
invalidate the cache. However, changes done on the remote will only
be picked up once the cache expires if the backend configured does not
support polling for changes. If the backend supports polling, changes
will be picked up on within the polling interval.
Alternatively, you can send a `SIGHUP` signal to rclone for
it to flush all directory caches, regardless of how old they are.
Assuming only one rclone instance is running, you can reset the cache
like this:
kill -SIGHUP $(pidof rclone)
If you configure rclone with a [remote control](/rc) then you can use
rclone rc to flush the whole directory cache:
rclone rc vfs/forget
Or individual files or directories:
rclone rc vfs/forget file=path/to/file dir=path/to/dir
### File Buffering
The `--buffer-size` flag determines the amount of memory,
that will be used to buffer data in advance.
Each open file descriptor will try to keep the specified amount of
data in memory at all times. The buffered data is bound to one file
descriptor and won't be shared between multiple open file descriptors
of the same file.
This flag is a upper limit for the used memory per file descriptor.
The buffer will only use memory for data that is downloaded but not
not yet read. If the buffer is empty, only a small amount of memory
will be used.
The maximum memory used by rclone for buffering can be up to
`--buffer-size * open files`.
### File Caching
These flags control the VFS file caching options. The VFS layer is
used by rclone mount to make a cloud storage system work more like a
normal file system.
You'll need to enable VFS caching if you want, for example, to read
and write simultaneously to a file. See below for more details.
Note that the VFS cache works in addition to the cache backend and you
may find that you need one or the other or both.
--cache-dir string Directory rclone will use for caching.
--vfs-cache-max-age duration Max age of objects in the cache. (default 1h0m0s)
--vfs-cache-mode string Cache mode off|minimal|writes|full (default "off")
--vfs-cache-poll-interval duration Interval to poll the cache for stale objects. (default 1m0s)
--vfs-cache-max-size int Max total size of objects in the cache. (default off)
If run with `-vv` rclone will print the location of the file cache. The
files are stored in the user cache file area which is OS dependent but
can be controlled with `--cache-dir` or setting the appropriate
environment variable.
The cache has 4 different modes selected by `--vfs-cache-mode`.
The higher the cache mode the more compatible rclone becomes at the
cost of using disk space.
Note that files are written back to the remote only when they are
closed so if rclone is quit or dies with open files then these won't
get written back to the remote. However they will still be in the on
disk cache.
If using --vfs-cache-max-size note that the cache may exceed this size
for two reasons. Firstly because it is only checked every
--vfs-cache-poll-interval. Secondly because open files cannot be
evicted from the cache.
#### --vfs-cache-mode off
In this mode the cache will read directly from the remote and write
directly to the remote without caching anything on disk.
This will mean some operations are not possible
* Files can't be opened for both read AND write
* Files opened for write can't be seeked
* Existing files opened for write must have O_TRUNC set
* Files open for read with O_TRUNC will be opened write only
* Files open for write only will behave as if O_TRUNC was supplied
* Open modes O_APPEND, O_TRUNC are ignored
* If an upload fails it can't be retried
#### --vfs-cache-mode minimal
This is very similar to "off" except that files opened for read AND
write will be buffered to disks. This means that files opened for
write will be a lot more compatible, but uses the minimal disk space.
These operations are not possible
* Files opened for write only can't be seeked
* Existing files opened for write must have O_TRUNC set
* Files opened for write only will ignore O_APPEND, O_TRUNC
* If an upload fails it can't be retried
#### --vfs-cache-mode writes
In this mode files opened for read only are still read directly from
the remote, write only and read/write files are buffered to disk
first.
This mode should support all normal file system operations.
If an upload fails it will be retried up to --low-level-retries times.
#### --vfs-cache-mode full
In this mode all reads and writes are buffered to and from disk. When
a file is opened for read it will be downloaded in its entirety first.
This may be appropriate for your needs, or you may prefer to look at
the cache backend which does a much more sophisticated job of caching,
including caching directory hierarchies and chunks of files.
In this mode, unlike the others, when a file is written to the disk,
it will be kept on the disk after it is written to the remote. It
will be purged on a schedule according to `--vfs-cache-max-age`.
This mode should support all normal file system operations.
If an upload or download fails it will be retried up to
--low-level-retries times.
### Case Sensitivity
Linux file systems are case-sensitive: two files can differ only
by case, and the exact case must be used when opening a file.
Windows is not like most other operating systems supported by rclone.
File systems in modern Windows are case-insensitive but case-preserving:
although existing files can be opened using any case, the exact case used
to create the file is preserved and available for programs to query.
It is not allowed for two files in the same directory to differ only by case.
Usually file systems on MacOS are case-insensitive. It is possible to make MacOS
file systems case-sensitive but that is not the default
The "--vfs-case-insensitive" mount flag controls how rclone handles these
two cases. If its value is "false", rclone passes file names to the mounted
file system as is. If the flag is "true" (or appears without a value on
command line), rclone may perform a "fixup" as explained below.
The user may specify a file name to open/delete/rename/etc with a case
different than what is stored on mounted file system. If an argument refers
to an existing file with exactly the same name, then the case of the existing
file on the disk will be used. However, if a file name with exactly the same
name is not found but a name differing only by case exists, rclone will
transparently fixup the name. This fixup happens only when an existing file
is requested. Case sensitivity of file names created anew by rclone is
controlled by an underlying mounted file system.
Note that case sensitivity of the operating system running rclone (the target)
may differ from case sensitivity of a file system mounted by rclone (the source).
The flag controls whether "fixup" is performed to satisfy the target.
If the flag is not provided on command line, then its default value depends
on the operating system where rclone runs: "true" on Windows and MacOS, "false"
otherwise. If the flag is provided without a value, then it is "true".
### Auth Proxy
If you supply the parameter `--auth-proxy /path/to/program` then
rclone will use that program to generate backends on the fly which
then are used to authenticate incoming requests. This uses a simple
JSON based protocl with input on STDIN and output on STDOUT.
**PLEASE NOTE:** `--auth-proxy` and `--authorized-keys` cannot be used
together, if `--auth-proxy` is set the authorized keys option will be
ignored.
There is an example program
[bin/test_proxy.py](https://github.com/rclone/rclone/blob/master/test_proxy.py)
in the rclone source code.
The program's job is to take a `user` and `pass` on the input and turn
those into the config for a backend on STDOUT in JSON format. This
config will have any default parameters for the backend added, but it
won't use configuration from environment variables or command line
options - it is the job of the proxy program to make a complete
config.
This config generated must have this extra parameter
- `_root` - root to use for the backend
And it may have this parameter
- `_obscure` - comma separated strings for parameters to obscure
If password authentication was used by the client, input to the proxy
process (on STDIN) would look similar to this:
```
{
"user": "me",
"pass": "mypassword"
}
```
If public-key authentication was used by the client, input to the
proxy process (on STDIN) would look similar to this:
```
{
"user": "me",
"public_key": "AAAAB3NzaC1yc2EAAAADAQABAAABAQDuwESFdAe14hVS6omeyX7edc...JQdf"
}
```
And as an example return this on STDOUT
```
{
"type": "sftp",
"_root": "",
"_obscure": "pass",
"user": "me",
"pass": "mypassword",
"host": "sftp.example.com"
}
```
This would mean that an SFTP backend would be created on the fly for
the `user` and `pass`/`public_key` returned in the output to the host given. Note
that since `_obscure` is set to `pass`, rclone will obscure the `pass`
parameter before creating the backend (which is required for sftp
backends).
The progam can manipulate the supplied `user` in any way, for example
to make proxy to many different sftp backends, you could make the
`user` be `user@example.com` and then set the `host` to `example.com`
in the output and the user to `user`. For security you'd probably want
to restrict the `host` to a limited list.
Note that an internal cache is keyed on `user` so only use that for
configuration, don't use `pass` or `public_key`. This also means that if a user's
password or public-key is changed the cache will need to expire (which takes 5 mins)
before it takes effect.
This can be used to build general purpose proxies to any kind of
backend that rclone supports.
```
rclone serve webdav remote:path [flags]
```
### Options
```
--addr string IPaddress:Port or :Port to bind server to. (default "localhost:8080")
--auth-proxy string A program to use to create the backend from the auth.
--baseurl string Prefix for URLs - leave blank for root.
--cert string SSL PEM key (concatenation of certificate and CA certificate)
--client-ca string Client certificate authority to verify clients with
--dir-cache-time duration Time to cache directory entries for. (default 5m0s)
--dir-perms FileMode Directory permissions (default 0777)
--disable-dir-list Disable HTML directory list on GET request for a directory
--etag-hash string Which hash to use for the ETag, or auto or blank for off
--file-perms FileMode File permissions (default 0666)
--gid uint32 Override the gid field set by the filesystem. (default 1000)
-h, --help help for webdav
--htpasswd string htpasswd file - if not provided no authentication is done
--key string SSL PEM Private key
--max-header-bytes int Maximum size of request header (default 4096)
--no-checksum Don't compare checksums on up/download.
--no-modtime Don't read/write the modification time (can speed things up).
--no-seek Don't allow seeking in files.
--pass string Password for authentication.
--poll-interval duration Time to wait between polling for changes. Must be smaller than dir-cache-time. Only on supported remotes. Set to 0 to disable. (default 1m0s)
--read-only Mount read-only.
--realm string realm for authentication (default "rclone")
--server-read-timeout duration Timeout for server reading data (default 1h0m0s)
--server-write-timeout duration Timeout for server writing data (default 1h0m0s)
--uid uint32 Override the uid field set by the filesystem. (default 1000)
--umask int Override the permission bits set by the filesystem. (default 2)
--user string User name for authentication.
--vfs-cache-max-age duration Max age of objects in the cache. (default 1h0m0s)
--vfs-cache-max-size SizeSuffix Max total size of objects in the cache. (default off)
--vfs-cache-mode CacheMode Cache mode off|minimal|writes|full (default off)
--vfs-cache-poll-interval duration Interval to poll the cache for stale objects. (default 1m0s)
--vfs-case-insensitive If a file name not found, find a case insensitive match.
--vfs-read-chunk-size SizeSuffix Read the source objects in chunks. (default 128M)
--vfs-read-chunk-size-limit SizeSuffix If greater than --vfs-read-chunk-size, double the chunk size after each chunk read, until the limit is reached. 'off' is unlimited. (default off)
```
See the [global flags page](/flags/) for global options not listed here.
### SEE ALSO
* [rclone serve](/commands/rclone_serve/) - Serve a remote over a protocol.
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