Silverlight: HTTP Request Headers
Overview
Silverlight limits the HTTP request headers that can sent with the HttpWebRequest and WebClient objects when making HTTP requests with these classes.
The following tables list the headers that are automatically set and also list which headers are not allowed.
Automatic Headers
The following headers are either set by properties, methods or by the system automatically.
| Header | Description |
|---|---|
| Accept | Set by the browser. |
| Connection | Set by the browser. |
| Content-Length | Set by the browser. |
| Content-Type | Set by the ContentType property. This header cannot be set for a GET method. |
| Expect | Set by the browser. |
| If-Modified-Since | Set by the browser. |
| Referer | Set by the browser. |
| Transfer-Encoding | Set by the browser. |
| User-Agent | Set by the browser. |
Restricted Headers
The following lists the most common headers that are restricted. These headers are often set automatically by the browser. Additional headers may also be restricted.
- Accept
- Accept-Charset
- Accept-Encoding
- Accept-Language
- Accept-Ranges
- Age
- Allow
- Allowed
- Authorization
- Connect
- Connection
- Content-Length
- Content-Location
- Content-Range
- Content-Transfer-Encoding
- Content-Type
- Cookie
- Date
- Delete
- ETag
- Expect
- Get
- Head
- Host
- Keep-Alive
- Last-Modified
- Location
- Max-Forwards
- Options
- Post
- Proxy-Authenticate
- Proxy-Authorization
- Proxy-Connection
- Public
- Put
- Range
- Referer
- Request-Range
- Retry-After
- Server
- TE
- Trace
- Trailer
- Transfer-Encoding
- Upgrade
- Uri
- User-Agent
- Vary
- Via
- Warning
- WWW-Authenticate
- X-Flash-Version
HTTP GET method
The following headers are additionally restricted when using the GET method.
- Content-Encoding
- Content-Language
- Content-Location
- Content-MD5
- Content-Range
- Content-Type
- Expires
- Last-Modified
HTTP POST method
The following headers are additionally restricted when using the POST method.
- Content-Location
- Content-Range
- Last-Modified
Further Reading
Related information on the web is listed below.