'WebDAV return 401 - How to authenticate?

I have a problem with WebDAV. I have to get a list of files. I have this request:

<?xml version="1.0"?>
<D:searchrequest xmlns:D = "DAV:">
<D:sql>
    SELECT "DAV:displayname" FROM "address" WHERE "DAV:ishidden" = false AND "DAV:isfolder" = false 
</D:sql>
</D:searchrequest>

Response:

401 - Unauthorized: Access is denied due to invalid credentials.

I have user and password (who has access), but I don't know, how I can put this data to XML request.

Solution 1:^[1]

WebDAV uses an HTTP authentication.

So you put your credentials to an HTTP header, not to the WebDAV XML in the HTTP body.

The basic HTTP authentication works like:

You get a WWW-Authenticate header from the server
```
WWW-Authenticate: Basic realm="server"
```
You include the Authorization header to the next request. The value of the header is:
```
Authorization: Basic username:password
```
where the username:password is in Base-64 encoding.
```
Authorization: Basic dXNlcjpwYXNzd29yZA==
```

For details, see

Basic access authentication on Wikipedia
RFC 7235: Hypertext Transfer Protocol (HTTP/1.1): Authentication

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Source: Stack Overflow

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'WebDAV return 401 - How to authenticate?

Solution 1:[1]

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Solution 1:^[1]