Handling binary content with API Gateway

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The responseType property of the XMLHttpRequest object can be set to change the expected response type from the server. Possible values are the empty string default"arraybuffer""blob""document""json"and "text".

This is null if the request is not complete or was not successful. This example reads an image as a binary file and creates an 8-bit unsigned integer array from the raw bytes. Note that this will not decode the image and read the pixels. You will need a png decoding library for that. An alternative to the above method utilizes the Blob interface to directly construct a Blob with using binary content for both request and response arraybuffer data. Also you can read a binary file as a Blob by setting the string "blob" to the responseType property.

The magic happens in line 5, which overrides the MIME binar olympians, forcing the browser to treat it as plain text, using a user-defined character set. This tells the browser not to parse it, and to let the bytes pass through unprocessed.

The example above fetches the byte at offset x within the loaded binary data. The valid range for x is from 0 to filestream. See also downloading files. The following example creates a text file on-the-fly and uses the POST method to send the "file" to the server. This example uses plain text, but you can imagine the data being a binary file instead. This is building a byte array of 8-bit integers and sending it; you can use any binary data you'd like, of course.

Please, read this paragraph. Line 4 sets the Content-Length header toindicating that the data is bytes long. Obviously you need to using binary content for both request and response this value based on the actual size of the data being sent.

You can also send binary content by passing an instance of the nsIFileInputStream to send. In that case, you don't have to set the Content-Length header yourself, as the information is fetched from the stream automatically:.

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Receiving binary data using JavaScript typed arrays The responseType property of the XMLHttpRequest object can be set using binary content for both request and response change the expected response type from the server. Add information about other browsers' support here. The standard send Blob data method can be used instead as explained above.

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It can transform incoming binary files into base64 encoded strings before passing on to a Lambda function, and transform base64 encoded Lambda resutls into binary files. Similarly, although the documentation suggests that multiple content types can be specified in the Accept header for binary responses, it seems that this breaks the conversion.

This makes the current implementation useless for browsers, which by default request complex Accept headers. Claudia API Builder makes it easier to handle binary content by doing several things automatically for you:.

To respond with binary content, make sure to set the response success. Claudia API Builder will automatically convert a binary buffer to a base64 string. You can also use the binary support to process incoming binary files. Claudia API Builder will populate request. For example, we can use the ImageMagick identify tool to get basic information about image files.

This example will save the incoming file, execute identify , clean up, and return the result. No specific API endpoint configuration is needed here. To use this service, make sure to include the Content-Type header into your request. We can combine both techniques to create a service for thumbnails. The endpoint will receive an image, resize it, and return the result. Note that we can directly store request body into a file Claudia API builder will process and convert the incoming body into a binary buffer , and that we can directly return the results of a binary file read Claudia API Builder will convert it into a base64 string.

To see this in action, check out the Binary Content Handling example project. Once a month, high value mailing list, no ads or spam. Check out the past issues. Incoming request are transformed into base64 strings if: It will automatically decode incoming baseencoded bodies into a Buffer object so you can directly save it to a file, for example.

It will automatically encode Buffer results into base It allows you to easily set incoming request and response content handling. Configuring an API Use api. If you plan to use one of those types, you do not need to call setBinaryMediaTypes.

Use requestContentHandling in the handler configuration to set the required incoming binary content handling behaviour API Gateway Integration content handling. Remember to set the success. Did you like this tutorial? Get notified when we publish the next one.