I should point out, this is only useful if you have a single page app. If
you load different html pages, don't do this, as you'll be reloading the
nocache.js for each page.
On Friday, 13 February 2026 at 12:00:28 pm UTC+11 Craig Mitchell wrote:
> Thanks Colin. Dug around a little and figured out all I needed was:
>
> <meta name="gwt:property" content="baseUrl=/dt/" />
>
> ("dt" is my GWT module short name)
>
> Now everything works, including superdevmode. Ie: No need for the
> gwtNoCacheJs.contains("superdevmode") check anymore.
>
> I think my page does load a bit faster now (on subsequent times, not the
> first visit). https://drift.team/ if anyone is curious what the end
> result root html source looks like.
>
> On Friday, 13 February 2026 at 10:16:23 am UTC+11 Colin Alworth wrote:
>
>> I believe that
>> https://github.com/gwtproject/gwt/blob/main/dev/core/src/com/google/gwt/core/ext/linker/impl/computeScriptBase.js
>>
>> is what you're going to want to read, or possibly replace on your
>> classpath. Alternatively, subclass the CrossSiteIframeLinker to override
>> getJsComputeScriptBase(LinkerContext) to provide your own file.
>>
>> From that file:
>> /**
>> * Determine our own script's URL by trying various things
>> *
>> * First - use the baseUrl meta tag if it exists
>> * Second - look for a script tag with the src set to
>> MODULE_NAME.nocache.js and
>> * if it's found, use it to determine the baseUrl
>> * Third - if the page is not already loaded, try to use some
>> document.write
>> * magic to install a temporary tag and use that to determine the
>> baseUrl.
>> *
>> * This is included into the selection scripts
>> * wherever COMPUTE_SCRIPT_BASE appears with underlines
>> * on each side.
>> */
>>
>> The "Second" step is where you appear to be getting stuck - since there
>> is no script tag with a src attr, the rest of the loading code doesn't know
>> what to do. So, add a meta tag for baseUrl so the script knows where the
>> other resources are loaded from.
>>
>> Note that I haven't messed with this in years, and might have missed a
>> point or two.
>>
>> On Thursday, February 12, 2026 at 4:54:23 PM UTC-6
>> [email protected] wrote:
>>
>>> I tried to inject the non-dev nocache.js into my main index.html file.
>>> Like this:
>>>
>>> String gwtNoCacheJs = loadFileFromServlet("/dt/dt.nocache.js");
>>>
>>> if (gwtNoCacheJs.contains("superdevmode")) {
>>> gwtNoCacheJs = "<script type='text/javascript'
>>> src='/dt/dt.nocache.js'></script>";
>>> }
>>> else {
>>> gwtNoCacheJs = "<script type='text/javascript'>\n" + gwtNoCacheJs + "
>>> \n</script>";
>>> }
>>>
>>> String html = loadFile("index.html").replace("XXX", gwtNoCacheJs);
>>>
>>> However, it doesn't work, as nocache.js wants to load files from the
>>> same sub directory it's located in, and not the root directory.
>>>
>>> Has anyone done this? It probably isn't work the effort, as it'll only
>>> save one network call, but I was curious if it's possible.
>>>
>>
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