Update readme

README.md

@@ -1,6 +1,6 @@
 # File URL Resource
 
-Downloads and tracks the update of a single URL-addressable file.  
+Tracks the update of a single URL-addressable file.
 This is a useful resource for pipeline development time, while a required artifact is temporarily available from a URL-addressable location, until it is moved to a more robust file management repository such as [git](https://github.com/concourse/git-resource) or [S3](https://github.com/concourse/s3-resource).  
 
 ## Source Configuration
@@ -36,9 +36,13 @@ resources:
 ### `check`: Check for the latest version of the file.
 
 The resource uses `curl` under-the-covers to post a GET request and retrieve the HTTP header info for the file URL provided.  
-If field `Last-Modified` is returned as part of the HTTP response header, then the resource will use that to build a version number timestamp with format "YYYYMMDDHHMMSS".
+If field `Last-Modified` is returned as part of the HTTP response header, then the resource will use that to build a version number timestamp with format "YYYYMMDDHHMMSS".  
 Otherwise, the timestamp string will be built using the request's current time, which will result in a new version being returned every time `check` is executed for that file.
 
+To verify if a file URL returns the `Last-Modified` information in its HTTP response header, issue the `curl` command below and search for field "Last-Modified" in its output.
+```curl -I <file-url>```
+
+
 ### `in`: Download the latest version of the file.
 
 Downloads the latest version of the file issuing a `curl` command under-the-covers.

pipeline.yml

@@ -6,16 +6,22 @@ resource_types:
     tag: latest
 
 resources:
-- name: my-file
+- name: my-file-with-last-modified-info
+  type: file-url
+  source:
+    url: https://s3-us-west-1.amazonaws.com/lsilva-bpws/PCF_usage/pcf-sandbox-usage-from-2016-09-01-to-2016-09-30_1475771124.json
+    filename: pcf-sandbox-usage.json
+- name: my-file-without-last-modified-info
   type: file-url
   source:
     url: https://raw.githubusercontent.com/pivotalservices/concourse-curl-resource/master/test/data/pivotal-1.0.0.txt
     filename: pivotal-1.0.0.txt
 
 jobs:
-- name: run-and-get-file
+- name: run-and-get-files
   plan:
-  - get: my-file
+  - get: my-file-with-last-modified-info
+  - get: my-file-without-last-modified-info
   - task: run-and-get-file
     config:
       platform: linux
@@ -25,7 +31,8 @@ jobs:
           repository: ubuntu
           tag: "latest"
       inputs:
-      - name: my-file
+      - name: my-file-with-last-modified-info
+      - name: my-file-without-last-modified-info
       run:
         path: sh
         args: