have an updated documentation for the web provider

Signed-off-by: Noam Gal <[email protected]>

docs/analysis/web.md

@@ -1,6 +1,6 @@
 # Web Metrics
 
-A HTTP request can be performed against some external service to obtain the measurement. This example
+An HTTP request can be performed against some external service to obtain the measurement. This example
 makes a HTTP GET request to some URL. The webhook response must return JSON content. The result of
 the optional `jsonPath` expression will be assigned to the `result` variable that can be referenced
 in the `successCondition` and `failureCondition` expressions. If omitted, will use the entire body
@@ -49,3 +49,26 @@ NOTE: if the result is a string, two convenience functions `asInt` and `asFloat`
 to convert a result value to a numeric type so that mathematical comparison operators can be used
 (e.g. >, <, >=, <=).
 
+### Optional web methods
+It is possible to use a POST or PUT requests, by specifying the `method` and `body` fields
+
+```yaml
+  metrics:
+  - name: webmetric
+    successCondition: result == true
+    provider:
+      web:
+        method: POST # valid values are GET|POST|PUT, defaults to GET
+        url: "http://my-server.com/api/v1/measurement?service={{ args.service-name }}"
+        timeoutSeconds: 20 # defaults to 10 seconds
+        headers:
+          - key: Authorization
+            value: "Bearer {{ args.api-token }}"
+          - key: Content-Type # if body is a json, it is recommended to set the Content-Type
+            value: "application/json"
+        body: "{\"key\": \"string value\"}"
+        jsonPath: "{$.data.ok}" 
+```
+  !!! tip
+      In order to send in JSON, you have to encode it yourself, and send the correct Content-Type as well.
+      Setting a `body` field for a `GET` request will result in an error.