What Are HttpHeaders?
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The Http Headers is immutable Map and each and
every set() returns a new instance and applies the changes with lazy parsing.
An immutable set of Http headers, with lazy
parsing.
HttpHeaders Constructor -
constructor(headers?:
string | { [name:
string]: string
| string[];});
Imports HttpHeaders from -
import
{HttpHeaders } from
'@angular/common/http';
HttpHeaders class contains the list of methods -
1. has()
- Checks for existence of header by given name.
2. get()
- Returns the first header that matches given name.
3. keys()
- Returns the names of the headers
4. getAll()
- Returns list of header values for a given name.
5. append()
- Append headers by chaining.
6. set()
- To set a custom header on the request
for a given name
7. delete()
- To delete the header on the request for a given name
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