Document New -Form Parameter for Web Cmdlets

reference/6/Microsoft.PowerShell.Utility/Invoke-RestMethod.md

@@ -136,6 +136,40 @@ Invoke-RestMethod $url -FollowRelLink -MaximumFollowRelLink 2
 
 Some REST APIs support pagination via Relation Links per [RFC5988](https://tools.ietf.org/html/rfc5988#page-6). Instead of parsing the header to get the URL for the next page, you can have the cmdlet do this for you. This example returns the first two pages of issues from the PowerShell GitHub repository
 
+### Example 4: Simplified Multipart/Form-Data Submission
+```powershell
+$Uri = 'https://api.contoso.com/v2/profile'
+$Form = @{
+    firstName  = 'John'
+    lastName   = 'Doe'
+    email      = '[email protected]'
+    avatar     = Get-Item -Path 'c:\Pictures\jdoe.png'
+    birthday   = '1980-10-15'
+    hobbies    = 'Hiking','Fishing','Jogging'
+}
+$Result = Invoke-RestMethod -Uri $Uri -Method Post -Form $Form
+```
+
+Some APIs require `multipart/form-data` submissions to upload files and mixed content.
+This example demonstrates updating a user profile.
+The profile form requires these fields:
+`firstName`, `lastName`, `email`, `avatar`, `birthday`, and `hobbies`.
+The API is expecting an image for the user profile pic to be supplied in the `avatar` field.
+The API will also accept multiple `hobbies` entries to be submitted in the same form.
+
+When creating the `$Form` HashTable, the key names are used as form field names.
+By default, the values of the HashTable will be converted to strings.
+If a `System.IO.FileInfo` value is present, the file contents will be submitted.
+If a collection such as arrays or lists are present,
+the form field will be submitted will be submitted multiple times.
+
+By using `Get-Item` on the `avatar` key, the `FileInfo` object will be set as the value.
+The result is that the image data for `jdoe.png` will be submitted.
+
+By supplying a list to the `hobbies` key,
+the `hobbies` field will be present in the submissions
+once for each list item.
+
 ## Parameters
 
 ### -AllowUnencryptedAuthentication
@@ -350,6 +384,60 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### -Form
+Converts a dictionary to a `multipart/form-data` submission.
+`-Form` may not be used with `-Body`.
+If `-ContentType` will be ignored.
+
+The keys of the dictionary will be used as the form field names.
+By default, form values will be converted to string values.
+
+If the value is a `System.IO.FileInfo` object,
+then the binary file contents will be submitted.
+The name of the file will be submitted as the `filename`.
+The MIME will be set as `application/octet-stream`.
+`Get-Item` can be used to simplify supplying the `System.IO.FileInfo` object.
+
+```powershell
+$Form = @{
+    resume = Get-Item 'c:\Users\jdoe\Documents\John Doe.pdf'
+}
+```
+
+If the value is a collection type,
+such Arrays or Lists,
+the for field will be submitted multiple times.
+The values of the the list will be treated as strings by default.
+If the value is a `System.IO.FileInfo` object,
+then the binary file contents will be submitted.
+Nested collections are not supported.
+
+```powershell
+$Form = @{
+    tags     = 'Vacation', 'Italy', '2017'
+    pictures = Get-ChildItem 'c:\Users\jdoe\Pictures\2017-Italy\'
+}
+```
+
+In the above example the `tags` field will be supplied 3 times in the form,
+once for each of `Vacation`, `Italy`, and `2017`.
+The `pictures` field will also be submitted once for each file in the `2017-Italy` folder.
+The binary contents of the files in that folder will be submitted as the values.
+
+This feature was added in PowerShell 6.1.0.
+
+```yaml
+Type: IDictionary
+Parameter Sets: (All)
+Aliases: 
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
 ### -Headers
 Specifies the headers of the web request.
 Enter a hash table or dictionary.

reference/6/Microsoft.PowerShell.Utility/Invoke-WebRequest.md

@@ -151,6 +151,40 @@ $Response = Invoke-WebRequest -Body $MultipartContent -Method 'POST' -Uri 'https
 
 This example uses the `Invoke-WebRequest` cmdlet upload a file as a `multipart/form-data` submission. The file `c:\document.txt` will be submitted as the form field `document` with the `Content-Type` of `text/plain`.
 
+### Example 5: Simplified Multipart/Form-Data Submission
+```powershell
+$Uri = 'https://api.contoso.com/v2/profile'
+$Form = @{
+    firstName  = 'John'
+    lastName   = 'Doe'
+    email      = '[email protected]'
+    avatar     = Get-Item -Path 'c:\Pictures\jdoe.png'
+    birthday   = '1980-10-15'
+    hobbies    = 'Hiking','Fishing','Jogging'
+}
+$Result = Invoke-RestMethod -Uri $Uri -Method Post -Form $Form
+```
+
+Some APIs require `multipart/form-data` submissions to upload files and mixed content.
+This example demonstrates updating a user profile.
+The profile form requires these fields:
+`firstName`, `lastName`, `email`, `avatar`, `birthday`, and `hobbies`.
+The API is expecting an image for the user profile pic to be supplied in the `avatar` field.
+The API will also accept multiple `hobbies` entries to be submitted in the same form.
+
+When creating the `$Form` HashTable, the key names are used as form field names.
+By default, the values of the HashTable will be converted to strings.
+If a `System.IO.FileInfo` value is present, the file contents will be submitted.
+If a collection such as arrays or lists are present,
+the form field will be submitted will be submitted multiple times.
+
+By using `Get-Item` on the `avatar` key, the `FileInfo` object will be set as the value.
+The result is that the image data for `jdoe.png` will be submitted.
+
+By supplying a list to the `hobbies` key,
+the `hobbies` field will be present in the submissions
+once for each list item.
+
 ## PARAMETERS
 
 ### -AllowUnencryptedAuthentication
@@ -346,6 +380,60 @@ Accept pipeline input: False
 Accept wildcard characters: False
 ```
 
+### -Form
+Converts a dictionary to a `multipart/form-data` submission.
+`-Form` may not be used with `-Body`.
+If `-ContentType` will be ignored.
+
+The keys of the dictionary will be used as the form field names.
+By default, form values will be converted to string values.
+
+If the value is a `System.IO.FileInfo` object,
+then the binary file contents will be submitted.
+The name of the file will be submitted as the `filename`.
+The MIME will be set as `application/octet-stream`.
+`Get-Item` can be used to simplify supplying the `System.IO.FileInfo` object.
+
+```powershell
+$Form = @{
+    resume = Get-Item 'c:\Users\jdoe\Documents\John Doe.pdf'
+}
+```
+
+If the value is a collection type,
+such Arrays or Lists,
+the for field will be submitted multiple times.
+The values of the the list will be treated as strings by default.
+If the value is a `System.IO.FileInfo` object,
+then the binary file contents will be submitted.
+Nested collections are not supported.
+
+```powershell
+$Form = @{
+    tags     = 'Vacation', 'Italy', '2017'
+    pictures = Get-ChildItem 'c:\Users\jdoe\Pictures\2017-Italy\'
+}
+```
+
+In the above example the `tags` field will be supplied 3 times in the form,
+once for each of `Vacation`, `Italy`, and `2017`.
+The `pictures` field will also be submitted once for each file in the `2017-Italy` folder.
+The binary contents of the files in that folder will be submitted as the values.
+
+This feature was added in PowerShell 6.1.0.
+
+```yaml
+Type: IDictionary
+Parameter Sets: (All)
+Aliases: 
+
+Required: False
+Position: Named
+Default value: None
+Accept pipeline input: False
+Accept wildcard characters: False
+```
+
 ### -Headers
 Specifies the headers of the web request.
 Enter a hash table or dictionary.