Notify me of new posts via email. BE shares development. March NetworkCredential "username", "password" ; [Net. Share this: Twitter Facebook. Like this: Like Loading March at Bernhard says:. Jordan M says:. Jake says:. May at Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:.
Below are the basic requirements. There are four methods to use PowerShell to download files that do not depend on third-party tools. These are:. Whichever one of these four methods you use, the logic and components to make them work are the same. If required by the webserver, you need to enter the credentials as well.
The next sections show each of these four methods. Whether the source location requires users to log in, the Invoke-WebRequest cmdlet can handle requests with credentials as well. To download a file, the syntax below shows the minimum parameters required to achieve the desired outcome. For example, the code below downloads a file with the name 10MB. You may copy the code below and paste it into your PowerShell session to test. The demonstration below shows the expected result after running the code above in PowerShell.
As you can see, the file download was successful. How about if the source requires authentication before allowing access? For example, the code below downloads a file from a private website where users must log in. If authentication is required, you should add a credential to the request using the -Credential parameter. As you can see, the Get-Credential cmdlet prompted a PowerShell credential request. This time, using the credential with Invoke-WebRequest resulted in a successful download.
A crucial thing to remember when using Invoke-WebRequest in Windows PowerShell is that, by default, this cmdlet uses the Internet Explorer engine to parse data. The error below may happen when using Invoke-WebRequest on computers without the Internet Explorer in it. Specify the UseBasicParsing parameter and try again. Starting with PowerShell Core 6. As such, the -UseBasicParsing parameter is no longer necessary. When it comes to downloading files straight from the web, Invoke-RestMethod is an excellent contender.
Do not be deceived into thinking otherwise. There is not much difference between using Invoke-RestMethod and Invoke-WebRequest when used for downloading files from a direct web link. To download a file using Invoke-RestMethod , use the syntax below. If the source requires authentication, you can pass the credentials using the -Credential parameter. Typically, you should avoid using HTTP sources for security. Start-BitsTransfer is designed specifically for transferring files between client and server computers.
Some of these benefits are:. The fundamental way to use Start-BitsTransfer in PowerShell to download a file is to specify a source and destination. Suppose the destination is not specified, Start-BitsTransfer downloads and saves the file to the current working directory. On my computer it was, and that was the problem. A quick reboot and my Direct Access problem the setup was failing and my Silverlight problem both went away.
There are all kinds of lessons from this story. Three lessons stand out:. Read the errors that are returned from application setup. If a link is offered, check it out—they are getting better all the time. The problem is that the website he was connecting to has an invalid certificate, and the site required HTTPS.
When using the DownloadFile method from the System. NET Framework class, the download will fail if the website has an invalid certificate. There are many reasons for a certificate to be invalid, a few of which are listed here:.
There are very good reasons that Internet Explorer warns you about a website that has an invalid certificate. An example of such a warning is shown in the following image.
If a certificate is from an untrusted CA, that is like trusting a room recommendation on a travel site that you do not know anything about. How do you know the travel recommendation is legitimate or bogus? If you see a travel recommendation on a legitimate website but it is from five years ago, how do you know if the hotel is still any good? On the other hand, if you see a great recommendation for a hotel, but the name of the hotel is different from the one you are looking at, how do you know the recommendation applies to the hotel you are thinking of booking?
If you have additional information, you might be able to make a determination. But with just the information presented, the safe decision is to ease on down the road. When SQLVariant asked about downloading a file from a particular site that had a bad certificate, he was familiar with the site and wanted to automate file downloading from a site that changes on a regular basis. Though the DownloadFile method is not overloaded to allow you to specify an override for invalid certificate check, there is a delegate that can be used to set up a callback for the ServerCertificateValidationCallback static method from the System.
NET Framework class. Windows PowerShell 2. Delegates are like. NET Framework versions of function pointers. The difference between.
NET Framework delegates and function pointers is that the.
0コメント