Invoke-webrequest download file output

And now we discuss that -OutFile will have additional semantics. This not only opens the way to new errors how to distinguish path and file? What is user skip final slash? It is very bad UX for script language. You just need to provide this feature,The user determines the processing method by the variable value. I should again notice that web cmdlets is very complex. We should avoid to add more complicity.

For file processing scenarios we have markekraus 's RFC. The proposed feature adds little complexity, from what I can tell, and only makes the download feature that is already there and won't go away complete. I don't see a need for a new parameter that passes just the header through - the proposed enhancement arguably: fix requires no new parameters and is the most straightforward solution to the problem.

Agree that the proposed enhancement and the RFC are not mutually exclusive and downloading the whole file just to get the filename is a pretty bad experience. Overloading -OutFile also seems prone to cause problems.

A new -OutPath may make more sense. Adding a new parameter is still preferable to not implementing this enhancement at all, but please consider this regarding overloading -OutFile :. While the word "file" in -OutFile may be confusing, that issue will go away with implementing the already green-lighted fix in - which should be implemented either way - because you would then use -LiteralPath , and "path" can refer to either files or directories.

Like most cmdlets, Invoke-WebRequest returns an object. Properties such as Links or ParsedHtml indicate that the main purpose of the cmdlet is to parse web pages. If you just want to access the plain content of the downloaded page, you can do so through the Content property:. Of course, you can also only read the HTTP header fields:. It may also be useful to have easy access to the HTTP response status codes and their descriptions:.

The Links property is an array of objects that contain all the hyperlinks in the web page. The URL that the hyperlink points to is stored in href. To get a list of all links in the web page, you could use this command:. You can use this property to read the anchor text of a hyperlink. Note that the Link object also has an outerText property, but its contents will always be identical to the innerText property if you read a web page. The Image property can be handled in a similar way as the Link property.

It, of course, does not contain the images. Instead, it stores objects with properties that contain HTML code that refers to the images. The most interesting properties are width , height , alt , and src. If you know a little HTML, you will know how to deal with these attributes.

With the help of the Split-Path cmdlet, we get the file name from the URL, which we use to store the image in the current folder. More interesting is that you can easily retrieve additonal information about the web page. For example, the following command tells you when the page was last modified:. Invoke-WebRequest also allows you to fill out form fields. If you use a web browser to submit a form, you usually see how the URL is constructed. For instance, the next command searches for PowerShell on 4sysops:.

If the website uses the POST method, things get a bit more complicated. The first thing you have to do is find out which method is used by displaying the forms objects:. A web page sometimes has multiple forms using different methods. Usually you recognize the form you need by inspecting the Fields column. If the column is cut off, you can display all the form fields with this command:.

Our goal is to scrape the country code of a particular IP address from a Whois website. We first have to find out how the form field is structured.

Because we are working on the PowerShell console, it is okay to use the alias of Invoke-WebRequest :. We are now ready to scrape the country code of the IP address from the result page:.

Update: The example no longer works because the web page uses a different form field now. You can use field variable now:. In the first line, we define a hash table that contains the names of our two form fields and the values we want to submit. In line 2, we store the result of the request page of the query in a variable. We then use the -match operator with a regular expression to search for the country code.

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