update vignette

- move cached to shorter path
- stop requesting png in vignette as doesnt work with cache

vignettes/Introduction_to_metabolomicsWorkbenchR.Rmd

@@ -24,6 +24,19 @@ vignette: >
 suppressPackageStartupMessages(library(grid))
 suppressPackageStartupMessages(library(httptest))
 suppressPackageStartupMessages(library(metabolomicsWorkbenchR))
+
+httptest::set_requester(
+    function(request){
+        httptest::gsub_request(request,'https\\://www.metabolomicsworkbench.org/rest',"mb/")
+    }
+)
+
+httptest::set_redactor(
+    function(response){
+        httptest::gsub_response(response,'https\\://www.metabolomicsworkbench.org/rest',"mb/")
+    }
+)
+
 httptest::start_vignette('introduction')
 ```
 
@@ -94,16 +107,13 @@ df[,1:3]
 ```
 We can also request an image of the molecular structure:
 
-```{r}
+```{r,eval=FALSE}
 img = do_query(
         context = 'compound',
         input_item = 'regno',
         input_value = '11',
         output_item = 'png'
       )
-
-grid.raster(img)
-
 ```
 
 Valid contexts, input items and output items can be listed using the `names` function:

vignettes/example_using_structToolbox.Rmd

@@ -24,6 +24,19 @@ vignette: >
 suppressPackageStartupMessages(library(structToolbox))
 suppressPackageStartupMessages(library(httptest))
 suppressPackageStartupMessages(library(metabolomicsWorkbenchR))
+
+httptest::set_requester(
+    function(request){
+        httptest::gsub_request(request,'https\\://www.metabolomicsworkbench.org/rest',"mb/")
+    }
+)
+
+httptest::set_redactor(
+    function(response){
+        httptest::gsub_response(response,'https\\://www.metabolomicsworkbench.org/rest',"mb/")
+    }
+)
+
 httptest::start_vignette('structToolbox_example')
 ```