Yeah, using the gwt property is the easiest solution. I also use it. But be
aware that you now have to update your webserver configuration to tell the
browser to not cache the index.html anymore. Otherwise the embedded GWT
code will be outdated if you deploy an updated version of your GWT app and
all the hashes of *.cache.js files have changed.
-- J.
Craig Mitchell schrieb am Freitag, 13. Februar 2026 um 02:00:28 UTC+1:
> 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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