Update README.md

Reorganized the documentation

README.md

@@ -15,31 +15,10 @@ If not already installed, download and install the Go distribution from https://
 
 ## Running sample app
 
-To run the crawl sample app against an internal sample web server simulating an app listing page HTML file (`sample_app_store.html`), specify the desired port using the `--sample_file_server_port` flag.  The app will crawl the app store URL, output the parse results, and then immediately terminate.
+The sample app can be run against any compliant app store URL.  For example, this command line demonstrates crawling an app in Google Play Store.
 
 ```
-cd examples/appadstxtcrawl
-go run sample_app.go --app_store_url=http://localhost:8081/sample_app_store.html --sample_file_server_port=8081
-```
-
-Sample output:
-
-```
-Parsed metadata:
-  Developer URL: https://sample.path.to/page
-  Bundle ID:     com.example.myapp
-  Store ID:      SKU12345
-
-Derived app-ads.txt URLs:
-  Registerable Domain URL: https://path.to/app-ads.txt
-  Subdomain URL:           https://sample.path.to/app-ads.txt
-```
-
-The app can be run against any other app store URL desired.  For example, this command line demonstrates crawling an app in Google Play Store.
-
-```
-cd examples/appadstxtcrawl
-go run sample_app.go --app_store_url=https://play.google.com/store/apps/details?id=com.google.android.apps.maps
+go run examples/appadstxtcrawl/sample_app.go --app_store_url=https://play.google.com/store/apps/details?id=com.google.android.apps.maps
 ```
 
 Sample output:
@@ -56,6 +35,8 @@ Derived app-ads.txt URLs:
 
 ```
 
+If the script receives a response other than HTTP 200 from the web server, it will terminate with an error message.
+
 Note: if the app store URL does not provide the required HTML meta tags, the
 script will display an empty result such as the following:
 
@@ -67,3 +48,25 @@ Parsed metadata:
 
 No developer URL found to parse.
 ```
+
+## Using a local store HTML page
+
+To run the crawl sample app against an internal sample web server simulating an app listing page HTML file (`sample_app_store.html`), specify the desired port using the `--sample_file_server_port` flag.  The app will crawl the app store URL, output the parse results, and then immediately terminate.  Note: the web server will look for files relative to your shell's current path, so change directory to the local HTML file location prior to running.
+
+```
+cd examples/appadstxtcrawl
+go run sample_app.go --app_store_url=http://localhost:8081/sample_app_store.html --sample_file_server_port=8081
+```
+
+Sample output:
+
+```
+Parsed metadata:
+  Developer URL: https://sample.path.to/page
+  Bundle ID:     com.example.myapp
+  Store ID:      SKU12345
+
+Derived app-ads.txt URLs:
+  Registerable Domain URL: https://path.to/app-ads.txt
+  Subdomain URL:           https://sample.path.to/app-ads.txt
+```