Commits on Feb 5, 2023

1. storage: add new backend HttpProxy …

   This patch adds a new storage backend `HttpProxy` which can access blobs through a http proxy server.
   
   The http proxy server can be local (using unix socket) or remote (using `https://` or using `http://`).
   
   `HttpProxy` uses two API endpoints to access the blobs:
   - `HEAD /path/to/blobs` to get the blob size
   - `GET /path/to/blobs` to read the blob
   
   The http proxy server should respect [the `Range` header](https://www.rfc-editor.org/rfc/rfc9110.html#name-range) to compute the offset and length of the blob.
   
   The example config files for this new backend may be:
   
   ```jsonc
   // for remote usage
   {
     "backend": {
       "type": "http-proxy",
       "config": {
         "addr": "http://127.0.0.1:9977",
         "path": "/namespace/<repo>/blobs"
       }
     }
   }
   ```
   
   or
   
   ```jsonc
   // for local unix socket
   {
     "backend": {
       "type": "http-proxy",
       "config": {
         "addr": "/path/to/unix/socket/file"
       }
     }
   }
   ```
   
   There is also a test in `http_proxy.rs` to make sure `HttpProxy` works well, which setups a simple http server and generates a `HttpProxy` backend to get contents from the server.
   
   Signed-off-by: Nan Li <loheagn@icloud.com>

   

   loheagn committed Feb 5, 2023
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