[Feature Request] Import/Export using HAR file format

[DaniloNC]

Feature description:

HAR file format is a de-facto standard for saving HTTP requests/responses and is supported by multiple tools including Google Chrome and Firefox developer tools.

Supporting this format would allow integration with multiple tools.

[latacora-tomekr]

👋 I was going to take a crack at the export feature.

I've got the UI wired up (I just used the JSONExporterControlPanel and JSONExporter as a starting point since a HAR file is just a big JSON dict.)

Here's a barebones sample of a HAR file where I think I've more or less removed all of the optional fields according to the spec. (added .txt as .har isn't allowed by github).

example.har.txt

How would you recommend going about creating the custom JSON dict that is required by the HAR Format?

[CoreyD97]

Thanks for looking into this @latacora-tomekr!
I think the best way to do this might be to define a specific GSON serializer that'll take a LogEntry object and build the "entry" element that the HAR format expects.

However as the gsonProvider used by the JSONExporter class has a serializer defined for the LogEntry class already, you might be best building a new Gson instance and registering the custom serializer within the HAR exporter class using something like:
Gson gson = new GsonBuilder().registerTypeAdapter(LogEntry.class, new HarSerializer()).create()

Then you could iterate over each entry to be exported and add them to your har export object.

Again, thank you very much for looking into this! :)

[latacora-tomekr]

I see, so I created a HarSerializer in the form of:

public class HarSerializer extends TypeAdapter<LogEntry> {

    @Override
    public void write(JsonWriter writer, LogEntry logEntry) throws IOException {

However, I think a LogEntry represents one possible request. So in the context of the HAR format, this serializer logic would just serialize one object in the entries array of the HAR file. Would I build out log > version, creator, entries on the gson object created by Gson gson = new GsonBuilder().registerTypeAdapter(LogEntry.class, new HarSerializer()).create()?

[CoreyD97]

Apologies, indeed you are correct in saying that LogEntry represents a single request. My previous comment probably wasn't the best method of doing this.

Instead, a TypeAdapter which could take an array (or list) of LogEntry objects would be sensible, and would allow the entire HAR object to be built within this class. The rest of the data for the HAR file such as version, creator etc could be provided when instantiating the serializer class.

Gson gson = new GsonBuilder().registerTypeAdapter(LogEntry[].class, new HarSerializer(version, creator)).create()