Download file with post request

Remember that a boundary must be unique and definitely not an ordinary string that could be potentially found in the actual data that will be uploaded. The fastest way to get a random string is to generate a UUID value:. It will be a concatenation of 20 dashes at the beginning and the transformed UUID value:. As an alternative to the above we can create a mechanism which will pick random characters from a collection of available characters, and using them to form a string which will be appended to the boundary string.

However, the second line of code requires from us to search for an ASCII table online and then locate the position of the characters we are interested in into the table. Data struct provides several initializers for creating a data object and there is one among them that accepts a sequence as an argument, exactly as we do in the Data sequenceOfRanges expression. From that data object, we can create the following string which is assigned to the toString constant:.

At first we initialize a string value called randomString. Then, we create a loop that will be executed 20 times. In it, we pick a random character from the toString string using the randomElement method, and we generate a new String value String toString.

This new String value is appended to the randomString. Note that is safe to force unwrap the value of the randomElement method, as it returns nil only in cases of empty collections.

Use the implementation you prefer the most. At the end of the day, both approaches are going to work equally well. These two dashes are not included in the dashes of the boundary string we generated in both approaches here.

This string will be provided as-is to the request as a request header along with the content type and server will try to locate it after the two dashes prefix. Also, a boundary string can exist with no dashes at all; we just add them to minimize the possibility to find similar string in the uploaded data.

As you will see later, the two dashes prefix will be manually appended whenever necessary. Our next steps involve the preparation of the HTTP body using any arbitrary data provided to the class, as well as using the files data.

But before we get into that, we will extend the Data structure and we will create the following generic method:. The purpose of this method is to let us easily append the values of the values collection to the data object that calls it.

Just for clarification, we could avoid implementing this method. However, the code that we will add to it would have to be repeated multiple times in different points in the RestManager class, and that definitely would not be a wise move.

So, to continue go to the end of the RestManager. In each repetition we will convert the string value into a Data object and we will append it to the local newData variable.

We will follow a quite similar approach in case of Data input values. Of course, there is no need to initialize any new Data object or make a conversion of any type.

We are appending one data value to another:. We are going to put it in action starting from the next part. In the current implementation of RestManager there is a method named getHttpBody. Its purpose is to prepare the HTTP body with the data that will be posted to the server. In the new extension of the RestManager class, right below the createBoundary method, add the following:.

Keep in mind that the HTTP body must be a Data value, so we are initializing such a value in this method, and this is also what the method returns. In this example the data is the username and the password. The following apply to each piece of data:.

You're calling a GET request when you're using window. This will open the url in a new tab with the URL. I've included some example code below. This includes the index. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Post request that returns a download file Ask Question. Asked 3 years, 3 months ago. Could you assist me what changes required in order to send with download work?

Download file when send request Help. How to download file while running collection runner? Need help in extracting the value. In this case, we will save the downloaded file as luckyNumber. Clivant a. He owns techcoil. IOException; import java. FileOutputStream; import java. HttpURLConnection; import java. URL; import java. Channels; import java.