cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
JonathanM
Frequent Visitor

HTTP Post multipart/form-data

Hi,

 

I am trying to post SharePoint files to a 3rd party via their API.  Their API uses multipart/form-data.  After some trial and error, I can POSTcontent, but only text files come out correctly on the destination.  Other files (Excel, Word, jpg, etc.) post, but the data is not readable. What do I need to do to the file content to format it properly?

 

Thanks!

 

http post.png

 

51 REPLIES 51

@davidlist87  Your file content is not base64 encoded. Where you are specifying the file content, use an expression like base64(body('whatever')?['File_Content']) where whatever is the name of the action where you got that file content from dropbox.

 

Write base64() in the expression builder, click between the brackets then switch to the dynamic content tab and find the File Content.

@WillPage thanks for your help but it seams to be throwing an input error.

My expression is: base64(body('When a file is modified')?['triggerBody()'])

Feel like we are really close...

Image 5.jpg

You need to use Get File Content as an additional step. After your trigger, add the Dropbox Get File Content action, and use its output in your HTTP POST.

@WillPage I was able to get the base64 conversion to work but am still getting the same error.

Thanks very much for your help mate👍

Image 7.jpg

 

The two properties of the body should be $content and $content-type. You've omitted the dollar signs.

I took the time to document this here: https://willpagenz.wordpress.com/2019/12/20/using-the-http-action-to-post-multipart-form-data-in-pow...

@WillPage you are a legend! Thank you so much to your contribution on this subject. Not a lot a info around about and you were all over it 👍

Image 10.jpg

Amazing! It works perfectly. So glad you posted solution, I've been trying to work it out for months 😀

Anonymous
Not applicable

Hi did u guys solve this ? i have a similair problem.  Thats my postman setup, need this into power automate. Its demanding a multipart/form-data, and a jpg url 

postman.png

Yes, it is solved and works. You cannot use the Postman code. Check how the solution is written. You need to be extremely careful to keep the json correctly formatted and re-write your field names as needed.

Anonymous
Not applicable

what shall be in the headers ? Content-type : multipart/form-data ? 

Anonymous
Not applicable

Hm getting connection, but image its not uploaded. I know the server demands multipart/form-data and jpeg 

this its my input 

{"uri":"https://login.glaskontroll.se/apitest/filesubmit.php","method":"POST","headers":{"Content-Type":"multipart/form-data"},"body":{"$content-type":"multipart/form-data","$multipart":[{"headers":{"Content-Disposition":"form-data; name=\"Username\""},"body":"test"},{"headers":{"Content-Disposition":"form-data; name=\"Password\""},"body":"pw"},{"headers":{"Content-Disposition":"form-data; name=\"Carregno\""},"body":"LJ0000"},{"headers":{"Content-Disposition":"form-data; name=\"Type\""},"body":"damage"},{"headers":{"Content-Disposition":"form-data; name=\"file\"; filename=\"navn.jpg\""},"body":{"$content-type":"application/jpg","$content":"base64url 

Not sure what is the output of your base64url...but in a previous action try getting file content (save file first to OneDrive for Business) and then put a base64() expression around your file content. Your expression will look like this:

base64(outputs('Get_file_content')?['body'])

 

Anonymous
Not applicable

Made it work, only thing its that i store the images in a collection from power apps, and some of the images its getting a "," before the base64url and causes a conflict 

You could trim off any leading comma in a compose using a formula like this (warning, phone typing!):

 

If(equals(substring({url},0,1),','),substring({url},1,sub(length({url}),1)),{url})

 

Where {url} is the dynamic content that contains the string. What this does is look at the first character, and if it equals a comma then trim the first character off, else return the whole string.

Anonymous
Not applicable

thanks it worked. One thing i am struggling with its that i think the power apps never executed the flow... The flow works if i test in power automate but when i test in power apps i dont see any response on the web server 

Make sure you have set the button / trigger correctly in PowerApps. See documentation below:

https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/using-logic-flows

 

If you have made changes in the Flow it may have broken the connection in PowerApps. To fix you remove the connection in PowerApps and then add it again (essentially refresh the connection). 

 

A good habit when doing this update is before reconnecting copy your existing PowerApp connection code somewhere. Once you update you lose any custom codes, variables etc that you wrote.

Anonymous
Not applicable

Found the issue it still inserts "," before the base64 😕

@WillPage 

@Anonymous 

 

Awesome work you guys have done here! 👍

cindyc
Frequent Visitor

Guys, thanks so much for all the great work!  It helped me immensely! I wanted to share what I was trying to accomplish and some of the things that you guys showed that got it working, just in case my scenario is similar to someone elses;

 

In MS FLOW, The built-in HTTP action is a "PREMIUM" action. I'm trying not to have the company Im helping spend anymore than they already are on MS TEAMS etc, so I can't/won't use any premium actions.

 

What I'm trying to do is come up with a free way to make a REST API call to my computer (that has a public hostname setup on one of my machines) so that when I send a PDF file over the API, I can have Flask/Python convert it into a text file, and send parsed out fields back to MS FLOW in json format.

 

It looks like Custom Connectors is the way to go.  But I ran into some problems.  Everything worked perfectly on Postman, the multipart/form-data was picked up from the request inside the request.files dict in flask, and I was able to (test save to make sure it was not corrupt) work on the file PDF no sweat. But when I tried to export the Postman collection in v1 export, it would not work.  I tried exporting the Postman v2 file and converting it to Swagger/OpenApi 2.0 json file, and while the conversion worked fine, getting the multipart/form-data piece to put the file inside request.files did not work, no matter what I tried.  But then I found this thread and things started to come together. After alot of fruitless testing from the Custom Connector Swagger Editor (it kept putting an @ in front of the filename for some reason, but I copied the CURL command and ran it from cmd, still to no avail), and then trying "Import from sample" in the Custom Connector Definition screen, nothing seemed to work, although a few times the filename did appear in requests.form dict in flask, but the data was not there. I tried putting the "$content-type": "multipart/form-data" string inside the header, and that didn't work either.  I did Use the MS FLOW HTTP action for a bit though, cuz I think you get a 30 day trial. Here is what I put in the HTTP action body section, with no header info, just to see if it would work;

 

cindyc_0-1612573646318.png

 

It worked just like the guys here said it would, multipart/form-data worked just like Postman did, and Flask/Python picked the file up in request.files and I was able to save the pdf file no prob. What worked for me to make sure the pdf file was not corrupted once it got to Flask/Python was to use;

 

base64(outputs('Get_file_content')?['body'])

 

I tried a few iterations like base64(outputs('Get_file_content')) <-- no ['body'], but the above was the one that worked.

 

But my custom connector was still having problems. Here is what finally worked in the "Import from sample" section, just like the guys here said it would;

 

cindyc_7-1612576459856.png

 

 

I just blurred out the filename above in the pic a little bit, but if you do it this way uploading a file via a MS FLOW Custom Connector will work.  Now here is one thing that stumped me; the Custom Connector "Test" screen. 

 

cindyc_2-1612574665070.png

 

I tested via this thing many, many times, and although the REST API call was made, the multipart/form-data was not properly formatted in the request object, meaning the pdf file was never in either request.files or request.form, or in the json object inside the request. But I decided to plug this Custom Connector inside the Flow I was working on, just to see if maybe it would be different, and possibly be properly formatted in the request object. And sure enough it was! Here is a look at the Flask/Python debugger with the pdf file inside request.files;

 

cindyc_9-1612577035392.png

 

What this shows is that the pdf 'file' is inside the requests.files dict and the multipart/form-data is properly formatted inside the REST API function. 

 

One other thing that got me right before it started working was how I was putting in the variables in the Connector once I put it into my Flow. In the Content-Disposition field I entered the information just like I did when I built the Custom Connector using "form-data; name=\"file\"; filename=\"20210129172849290.pdf\"".

But when it gets to the API, it will add a bunch of extra uneeded characters.  I decided not to use the text editor fields to put the data inside the Connector, I just use the fields/text boxes provided by the Custom Connector which works fine. So I removed the slashes and double quotes, and now here is what the Custom Connector looks like inside my flow with everything working (just blurred the filename a little);

 

cindyc_8-1612576638749.png

 

 

Thank you so much for all the help, I was pulling my hair out for a long while, could not have done it without you!,

Thanks,

EC

 

 

TT_TX
New Member

First I want to say thanks to everyone on this post as it helped me get to this point.  I have a similar use case in needing to copy files from OneDrive/DropBox etc. to Procore's Document Management Tool via their file upload API which requires a multipart/form-data format.  I ran into similar roadblocks as mentioned previously in this post but was able to configure a Custom Connector to accomplish this by taking the following steps:  

 

Note that Procore's API's require OAuth 2.0 and hence part of my motivation to use a Custom Connector as I was able to get the authentication piece working with other Procore API calls.         

 

Steps Taken:

1.  Successfully tested the API using Postman - Body - form-data

Postman Procore File Upload.png

 

2. Exported the Postman Collection in v2.1 format

Postman Collection Export.png

3. Even though the Power Automate Custom Connector import shows that it supports Postman v1.0, v2.0 and v2.1 it only seems to support v1.0 which I confirmed with MS Support.  The latest version of Postman does not support exporting in v1.0 so per MS Support's suggestion, I used APIMatic to convert the file.  When I attempted to convert it to Postman v1.0 it seemed to drop the "multipart/form-data" configuration.  I don't know if this is because v1.0 didn't support it or if conversion tool has an issue but regardless I decided to convert it to OpenAPI/Swagger v2.0 (JSON) instead with the idea of pasting it directly into the Swagger Editor.  

APIMatic .png

   

4.  The converted File for some reason set the following even though the Postman export was correct: 

  • "consumes["application/x-www-form-urlencoded"],
  • {name: 'file[data]', in: formData, required: true, type: string, description: ''}

5.  Manually replaced the following

  • "consumes": ["multipart/form-data"],
  • {name: 'file[data]', in: formData, required: true, type: file, description: ''}

6.  Pasted converted/modified file directly into the Swagger Editor.  Note that when creating (saving) the Custom Connector and re-opening the Swagger Editor, what I pasted was reformatted but code remained in-tact.  

TT_TX_0-1629664095662.png

PA Customer Connector - Swagger 2_0.jpg

7.   Next I attempted to use Swagger to test the call but received "TypeError:  Failed to Fetch".  Any suggestion here would be appreciated.  

Swagger Test.jpg

TT_TX_1-1629664179772.png

 

8.  Used the Connector in a Flow.  Note that I had to enter the File Content under "body" vs.  File[data] which doesn't make sense to me.  I didn't expect to see "body" as a field... any suggestions here would also be appreciated.   

 
 

Custom Connector In Flow.jpg

9.  Validated files uploaded successfully

Procore Success.jpg

 Next step will be to stress test this by uploading 500+ files via looping through a list but thought I would share to this point.    

Helpful resources

Announcements

Celebrating a New Season of Super Users with Charles Lamanna, CVP Microsoft Business Applications

February 8 was the kickoff to the 2024 Season One Super User program for Power Platform Communities, and we are thrilled to welcome back so many returning Super Users--as well as so many brand new Super Users who started their journey last fall. Our Community Super Users are the true heroes, answering questions, providing solutions, filtering spam, and so much more. The impact they make on the Communities each day is significant, and we wanted to do something special to welcome them at our first kickoff meeting of the year.   Charles Lamanna, Microsoft CVP of Business Applications, has stressed frequently how valuable our Community is to the growth and potential of Power Platform, and we are honored to share this message from him to our 2024 Season One Super Users--as well as anyone who might be interested in joining this elite group of Community members.     If you want to know more about Super Users, check out these posts for more information today:    Power Apps: What is A Super User? - Power Platform CommunityPower Automate: What is A Super User? - Power Platform Community Copilot Studio: What is A Super User? - Power Platform Community Power Pages: What is A Super User? - Power Platform Community

February 2024 User Group Update: Welcoming New Groups and Highlighting Upcoming Events

It's a new month and a brand-new year, which means another opportunity to celebrate our amazing User Groups!Each month, we highlight the new User Groups that have joined the community. It's been a busy season for new groups, because we are thrilled to welcome 15 New User Groups! Take a look at the list below, shared by the different community categories. If your group is listed here, give this post a kudo so we can celebrate with you!   We love our User Groups and the difference they make in the lives of our Community! Thank you to all the new User Groups, new User Group leaders--we look forward to hearing about your successes and the impact you will leave!   In addition to our monthly User Group spotlight, it's a great time to share some of the latest events happening in our User Group community! Take a look at the list below to find one that fits your schedule and need! There's a great combination of in-person and virtual events to choose from. Also, don't forget to review the many events happening near you or virtually! It's a great time of year to connect and engage with User Groups both locally and online. Please Welcome Our NEW User Groups   Power Platform: Heathcare Power Platform User Group Power Platform Connect Hub Power Platform Usergroup Denmark Mexico Norte- Power Platform User Group Pune Power User Group Sudbury Power Platform User GroupMicrosoft User Group GhanaMPPBLR - Microsoft Power Platform Bengaluru User Group Power Apps:   Myrtle Beach Power Platform User GroupAnanseTechWB PowerApps Copilot Studio: Pathfinders Power Platform Community Dynamics365: Cairo, Egypt MSD 365 Business Central/NAV/F&O User GruopMS Dynamics 365 Business Central LatamCincinnati OH D365 F&O User Group February User Group Events February 2024 Cleveland Power Platform User GroupPortallunsj - Februar 2024Indiana D365/AX February User Group MeetingQ1 2024 KC Power Platform and Dynamics 365 CRM Users Group 

January 2024 Community Newsletter

Welcome to our January Newsletter, where we highlight the latest news, product releases, upcoming events, and the amazing work of our outstanding Community members. If you're new to the Community, please make sure to follow the latest News & Announcements in each Community and check out the Community on LinkedIn as well! It's the best way to stay up-to-date in 2024 with all the news from across Microsoft Power Platform and beyond.      COMMUNITY HIGHLIGHTS Check out the most active community members of the last month! These hardworking members are posting regularly, answering questions, giving (and receiving!) kudos, and consistently providing top solutions in their communities. We are so thankful for each of you--keep up the great work! If you hope to see your name here next month, make it your New Year's Resolution to be more active in the community in 2024.   Power AppsPower AutomateCopilot StudioPower PagesWarrenBelzWarrenBelzPstork1saudali_25LaurensMPstork1stephenrobertLucas001AARON_ClbendincpaytonSurendran_RANBNived_NambiarMariamPaulachanNikhil2JmanriqueriosANBJupyter123rodger-stmmbr1606Agniusstevesmith27mandelaPhineastrice602AnnaMoyalanOOlashynBCLS776grantjenkinsExpiscornovusJcookSpongYeAARON_CManishSolankiapangelesPstork1ManishSolankiSanju1Fubar   LATEST NEWS Power Platform 2024 Release Wave Highlights This month saw the 2024 Release Wave 1 plans for Microsoft Power Platform and Microsoft Dynamics 365- a compilation of new capabilities planned for release between April and September 2024. Click here to read Corporate Vice President Maureen (Mo) Osborne's detailed breakdown of the upcoming capabilities, and click the image below to check out some of the Power Platform 2024 Release Wave 1 highlights.     "What's New" Power Platform Shorts Series This month we also launched our brand-new 'Power Shorts' series on YouTube - a selection of super sweet snapshots to keep you in the loop with all the latest trends from across the Power Platform and beyond. Click the image below to check out the entire playlist so far, and don't forget to subscribe to our YouTube channel for all the latest updates.   Super User In Training (S.U.I.T) It was great to see the Power Platform Community officially kick off Season One of their Super User in Training (SUIT) program this month! Their first meeting saw an amazing turnout of over 300 enthusiastic participants who started their dynamic journey toward becoming Super Users. Huge thanks to Manas Maheshwari, Eric Archer, Heather Hernandez, and Duane Montague for a fantastic kick-off. The first meeting also saw seasoned Super User, Drew Poggemann, share invaluable insights on navigating the #MicrosoftCommunity with finesse. Many thanks to Drew for setting the stage and emphasizing the importance of active engagement and the art of providing thoughtful community solutions. If you want to learn more about the features and benefits of gaining Super User status, click the image below to find out more, and watch this space for more info about Season Two and how you can SUIT UP in the community!     UPCOMING EVENTS Microsoft 365 Community Day - Miami - February 1-2, 2024 It's not long now until the Microsoft 365 Community Day Miami, which will be taking place at the Wolfson Campus at Miami Dade College on 1-2 Feb. 2024. This free event is all about unlocking the full potential of Power Platform, Microsoft 365, and AI, so whether you’re a tech enthusiast, a business owner, or just curious about the latest Microsoft advancements, #M365Miami is for you.   The event is completely free and there will sessions in both English and Spanish to celebrate the vibrant and diverse make-up of our amazing community. Click the image below to join this amazing Community Day in Miami and become a part of our incredible network of learners and innovators!     Microsoft Fabric - Las Vegas - March 26-28, 2024 Exciting times ahead for the inaugural #MicrosoftFabric Community Conference on March 26-28 at the MGM Grand in Las Vegas. And if you book now, you can save $100 off registration! The Microsoft Fabric Conference will cover all the latest in analytics, AI, databases, and governance across 150+ sessions.   There will be a special Community Lounge onsite, interactive learning labs, plus you'll be able to 'Ask the Experts' all your questions to get help from data, analytics, and AI specialists, including community members and the Fabric Customer Advisory Team. Just add the code MSCUST when registering for a $100 discount today. Click the image below to find out more about the ultimate learning event for Microsoft Fabric!     Microsoft 365 Conference - Orlando - April 30 - May 2, 2024 Have you added The Microsoft 365 Conference to your community calendar yet? It happens this April 30th - May 2nd in Orlando, Florida. The 2024 Microsoft 365 Conference is one of the world’s largest gatherings of Microsoft engineers and community, with a strong focus on Power Platform, SharePoint, Azure, and the transition to an AI-powered modern workplace.   Click the image link below to find out more and be prepared to be enlightened, educated, and inspired at #M365Conf24!   LATEST COMMUNITY BLOG ARTICLES Power Apps Community Blog Power Automate Community Blog Copilot Studio Community Blog Power Pages Community Blog Check out 'Using the Community' for more helpful tips and information: Power Apps, Power Automate, Copilot Studio, Power Pages  

Super Users 2024 Season One is Here!

   We are excited to announce the first season of our 2024 Super Users is here! Our kickoff to the new year welcomes many returning Super Users and several new faces, and it's always exciting to see the impact these incredible individuals will have on the Community in 2024! We are so grateful for the daily difference they make in the Community already and know they will keep staying engaged and excited for all that will happen this year.   How to Spot a Super User in the Community:Have you ever written a post or asked for help in the Community and had it answered by a user with the Super User icon next to their name? It means you have found the actual, real-life superheroes of the Power Platform Community! Super Users are our heroes because of the way they consistently make a difference in the Community. Our amazing Super Users help keep the Community a safe place by flagging spam and letting the Community Managers know about issues. They also make the Community a great place to find answers, because they are often the first to offer solutions and get clarity on questions. Finally, Super Users share valuable insights on ways to keep the Community growing, engaging, and looking ahead!We are honored to reveal the new badges for this season of Super Users! Congratulations to all the new and returning Super Users!     To better answer the question "What is a Super User?" please check out this article: Power Apps: What is A Super User? - Power Platform CommunityPower Automate: What is A Super User? - Power Platform Community Copilot Studio: What is A Super User? - Power Platform Community Power Pages: What is A Super User? - Power Platform Community

Did You Attend the Microsoft Power Platform Conference in 2022 or 2023? Claim Your Badge Today!

If you were one of the thousands of people who joined us at the first #MPPC Microsoft Power Platform Conference in 2022 in Orlando--or attended the second-annual conference in Las Vegas in 2023--we are excited to honor you with a special community badge! Show your support for #MPPC Microsoft Power Platform Conference this year by claiming your badge!           Just follow this link to claim your badge for attending #MPPC in 2022 and/or 2023: MPPCBadgeRequest    Want to earn your badge for 2024? Just keep watching our News & Announcements for the latest updates on #MPPC24.

Microsoft Power Platform | 2024 Release Wave 1 Plan

Check out the latest Microsoft Power Platform release plans for 2024!   We have a whole host of exciting new features to help you be more productive, enhance delegation, run automated testing, build responsive pages, and so much more.    Click the links below to see not only our forthcoming releases, but to also try out some of the new features that have recently been released to market across:     Power Apps  Power Automate  Copilot Studio   We can’t wait to share with you all the upcoming releases that will help take your Power Platform experience to the next level!    Check out the entire Release Wave: Power Platform Complete Release Planner 

Users online (4,058)