The following headers can be used to provide meta information about a request. 
Request headers
| 
 Header 
 | 
 Type 
 | 
 Mandatory 
 | 
 Description 
 | 
||
| 
 Authorization 
 | 
 String 
 | 
 Yes 
 | 
 Authentication information to prove you are authorized to access the resources you
                              requested. 
Trend Micro Email
                                 Security supports HTTP basic
                              authentication. The client sends HTTP requests with the Authorization header that consists of Basic and a
                              Base64-encoded string username:apikey. 
For example, if the user name is apitest01 and the
                              API key you obtained is d9dfae099217ea5fe0752f2511d15f937e2b785d,
                              convert the string apitest01:d9dfae099217ea5fe0752f2511d15f937e2b785d to Base64 encoded format, and
                              the following is generated: 
YXBpdGVzdDAxOmY5ZGZhZTA5OTIxN2VhNWZlMDc1MmYyNTExZDE1ZjkzN2UyYjc4NWQ= 
In this case, the Authorization header will be: 
Authorization: Basic YXBpdGVzdDAxOmY5ZGZhZTA5OTIxN2VhNWZlMDc1MmYyNTExZDE1ZjkzN2UyYjc4NWQ= 
  | 
||
| 
 Accept-Encoding 
 | 
 gzip/deflate 
 | 
 No 
 | 
 List of acceptable encodings to support compression. 
To improve the transfer speed and bandwidth utilization, Trend Micro Email
                                 Security supports HTTP compression with the following
                              compression schemes: 
 If HTTP compression is required in the request, the header
                              Accept-Encoding should be added with the supported compression scheme. 
Here is an example: 
Accept-Encoding: gzip,deflate | 
||
| 
 Content-Encoding 
 | 
 gzip/deflate 
 | 
 No 
 | 
 Encoding used on data in the request body. 
The following compression schemes are supported: 
 For example, if the body is encoded by "gzip", the following header should be added: 
Content-Encoding: gzip | 
		