Can't use {HTTP_HOST} for multiple rewrite rules in web.config file with GoDaddy Hosting - IIS 7.0

Question

I came across a weird issue while creating a few rewrite rules for my website which is hosted by GoDaddy. I'm able to create one rewrite rule using the {HTTP_HOST} or {SERVER_NAME} variables, but at the time of adding a second rule, it looks like the {HTTP_HOST}/{SERVER_NAME} doesn't return a value (I guess), so my code fails.

After a small mistake, I found a work around to the issue (which I will add at the bottom). I'm asking this question because I would like to:

• Understand the reason of this behavior
• Know if this is happening to someone else
• Find out if my approach is wrong or if I'm missing something for it to work

Due to this issue, I decided to clear my whole web.config file for testing purposes and have only the rewrite rules. I tried multiple changes, but I can't recall all of them at this time, so I will add as much as I remember.

Issue

This code works

    <system.webServer>
        <rewrite>
            <rules>
                <rule name="Mask myFile.xml" stopProcessing="true" patternSyntax="Wildcard">
                    <!-- This rule always -->
                    <match url="*" />
                    <conditions>
                        <add input="{REQUEST_URI}" pattern="/myFile.xml" />
                    </conditions>
                    <action type="Rewrite" url="/SiteDependentFiles/{HTTP_HOST}/new_myFile.xml"  appendQueryString="false"/>
                </rule>
            </rules>
        </rewrite>
    </system.webServer>

This code doesn't (see notes inside code)

    <system.webServer>
        <rewrite>
            <rules>
                <rule name="Mask myFile.xml" stopProcessing="true" patternSyntax="Wildcard">
                    <!-- This rule works on and off. When it doesn't work, it returns a 404 (Not found) error -->
                    <match url="*" />
                    <conditions>
                        <add input="{REQUEST_URI}" pattern="/myFile.xml" />
                    </conditions>
                    <action type="Rewrite" url="/SiteDependentFiles/{HTTP_HOST}/new_myFile.xml"  appendQueryString="false"/>
                </rule>
                <rule name="Mask thisThingy.txt" stopProcessing="true" patternSyntax="Wildcard">
                    <!-- This rule never works and it returns a 500 (Internal Server) error -->
                    <match url="*" />
                    <conditions>
                        <add input="{REQUEST_URI}" pattern="/thisThingy.txt" />
                    </conditions>
                    <action type="Rewrite" url="/SiteDependentFiles/{HTTP_HOST}/new_thisThingy.txt"  appendQueryString="false"/>
                </rule>
            </rules>
        </rewrite>
    </system.webServer>

This is what I get in the "detail report"

404.0 Error - Details

• Module: IIS Web Core
• Notification: MapRequestHandler
• Handler: StaticFile
• Error Code: 0x80070002
• Requested URL: http://mySiteName.com:80/myFile.xml
• Physical Path: D:\Hosting\123123123\html\myFile.xml
• Logon Method: Anonymous
• Logon User: Anonymous

500.0 Error - Details

• Module: ServerSideIncludeModule
• Notification: ExecuteRequestHandler
• Handler: SSI-html
• Error Code: 0x80070002
• Requested URL: http://mySiteName.com:80/thisThingy.txt
• Physical Path: D:\Hosting\123123123\html\thisThingy.txt
• Logon Method: Anonymous
• Logon User: Anonymous

Now, if change {HTTP_HOST} for a string in the second rule only, both rules start working:

    <action type="Rewrite" url="/SiteDependentFiles/StaticFolderName/new_thisThingy.txt"  appendQueryString="false"/>

Please note:

I also tried using a different patternSyntax option, Redirect instead of Rewrite, stopProcessing="false", used {SERVER_NAME} instead of {HTTP_HOST}, added <clear /> before first rule, but nothing changes. Same behavior.

Workaround

Always add a rule condition with {HTTP_HOST} to be able to use {SERVER_NAME} as variable for rule's action

    <system.webServer>
        <rewrite>
            <rules>
                <clear /> 
                <!--
                    ALWAYS ADD <add input="{HTTP_HOST}" pattern="*" /> TO BE 
                    ABLE TO USE {SERVER_NAME} MULTIPLE TIMES. (GODADDY ISSUE)
                -->
                <rule name="Mask myFile.xml" stopProcessing="true" patternSyntax="Wildcard">
                    <match url="*" />
                    <conditions>
                        <add input="{HTTP_HOST}" pattern="*" />
                        <add input="{REQUEST_URI}" pattern="/myFile.xml" />
                    </conditions>
                    <action type="Rewrite" url="/SiteDependentFiles/{SERVER_NAME}/new_myFile.xml"  appendQueryString="false"/>
                </rule>
                <rule name="Mask thisThingy.txt" stopProcessing="true" patternSyntax="Wildcard">
                    <match url="*" />
                    <conditions>
                        <add input="{HTTP_HOST}" pattern="*" />
                        <add input="{REQUEST_URI}" pattern="/thisThingy.txt" />
                    </conditions>
                    <action type="Rewrite" url="/SiteDependentFiles/{SERVER_NAME}/new_thisThingy.txt"  appendQueryString="false"/>
                </rule>
            </rules>
        </rewrite>
    </system.webServer>

Please note:

• I'm using {HTTP_HOST} and {SERVER_NAME}, but using only {HTTP_HOST}could work. I can't test this right now.

Thank you